Appendices
PHP Manual

Changelog

The following changes have been made to functions of bundled extensions.

VersionFunctionDescription
Before 5.1.0get_parent_classIf called without parameter outside object, this function would have returned NULL with a warning.
before 4.3.5dba_openopen mode "c" is broken for several internal handlers and truncates the database instead of appending data to an existent database. Also dbm and ndbm fail on mode "c" in typical configurations (this cannot be fixed).
5.4.1hex2binA warning is thrown if the input string is of odd length. In PHP 5.4.0 the string was silently accepted, but the last byte was truncated.
5.4.0apache_child_terminateThis function became available under FastCGI. Previously, it was supported only when PHP was installed as an Apache module.
 apache_request_headersThis function became available under FastCGI. Previously, it was supported only when PHP was installed as an Apache module.
 apache_response_headersThis function became available under FastCGI. Previously, it was supported only when PHP was installed as an Apache module.
 array_combinePrevious versions issued E_WARNING and returned FALSE for empty arrays.
 date_default_timezone_getThe timezone is no longer guessed from information available through the operating system as the guessed timezone can not be relied on.
 date_default_timezone_getThe TZ environment variable is no longer used to guess the timezone.
 debug_backtraceAdded the optional parameter limit.
 debug_print_backtraceAdded the optional parameter limit.
 emptyChecking non-numeric offsets of strings returns TRUE.
 error_reportingE_STRICT became part of E_ALL.
 get_html_translation_tableThe constants ENT_HTML401, ENT_XML1, ENT_XHTML and ENT_HTML5 were added.
 get_html_translation_tableThe default value for the encoding parameter was changed to UTF-8.
 get_magic_quotes_gpcAlways returns FALSE because the magic quotes feature was removed from PHP.
 get_magic_quotes_runtimeAlways returns FALSE because the magic quotes feature was removed from PHP.
 getallheadersThis function became available under FastCGI. Previously, it was supported only when PHP was installed as an Apache module.
 html_entity_decodeThe constants ENT_HTML401, ENT_XML1, ENT_XHTML and ENT_HTML5 were added.
 html_entity_decodeDefault encoding changed from ISO-8859-1 to UTF-8.
 htmlentitiesThe constants ENT_SUBSTITUTE, ENT_DISALLOWED, ENT_HTML401, ENT_XML1, ENT_XHTML and ENT_HTML5 were added.
 htmlentitiesThe default value for the encoding parameter was changed to UTF-8.
 htmlspecialcharsThe default value for the encoding parameter was changed to UTF-8.
 htmlspecialcharsThe constants ENT_SUBSTITUTE, ENT_DISALLOWED, ENT_HTML401, ENT_XML1, ENT_XHTML and ENT_HTML5 were added.
 htmlspecialchars_decodeThe constants ENT_HTML401, ENT_XML1, ENT_XHTML and ENT_HTML5 were added.
 http_build_queryThe enc_type parameter was added.
 imagecolorsetThe alpha parameter was added.
 issetChecking non-numeric offsets of strings now returns FALSE.
 json_decodeThe options parameter was added.
 json_encodeJSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, and JSON_UNESCAPED_UNICODE options were added.
 number_formatThis function now supports multiple bytes in dec_point and thousands_sep. Only the first byte of each separator was used in older versions.
 ob_startA chunk size of 1 now results in chunks of 1 byte being sent to the output buffer.
 preg_match_allThe matches parameter became optional.
 scandirsorting_order constants were added. Any nonzero value caused descending order in previous versions. So for all PHP versions, use 0 for ascending order, and 1 for descending order. An option for SCANDIR_SORT_NONE behavior did not exist prior to PHP 5.4.0.
 session_set_save_handlerAdded SessionHandlerInterface for implementing session handlers and SessionHandler to expose internal PHP session handlers.
 snmp_set_valueretrievalConstants SNMP_VALUE_PLAIN or SNMP_VALUE_LIBRARY may be combined with SNMP_VALUE_OBJECT resulting different way of representing contents of value array element in return value of GET-function. If no SNMP_VALUE_{PLAIN,LIBRARY} constant is accompanying SNMP_VALUE_OBJECT, SNMP_VALUE_LIBRARY is used. Prior to 5.4.0 SNMP_VALUE_OBJECT effecively meant SNMP_VALUE_OBJECT|SNMP_VALUE_PLAIN.
 SoapClient::SoapClientNew keep_alive option.
5.3.9is_aAdded allow_string parameter
 is_subclass_ofAdded allow_string parameter
5.3.6DateTime::modifyAbsolute date/time statements now take effect. Previously, only relative parts were used.
 DOMDocument::saveHTMLThe node parameter was added.
 debug_backtraceThe parameter provide_object changed to options and additional option DEBUG_BACKTRACE_IGNORE_ARGS is added.
 debug_print_backtraceAdded the optional parameter options.
 preg_matchReturns FALSE if offset is higher than subject length.
 preg_match_allReturns FALSE if offset is higher than subject length.
 PDO_MYSQL DSNPrior to version 5.3.6, charset was ignored.
5.3.4get_html_translation_tableThe encoding parameter was added.
 rawurlencodeTilde characters are no longer encoded when rawurlencode is used with EBCDIC strings.
 sleepBefore PHP 5.3.4, on Windows, sleep always returns NULL when sleep has occurred, regardless of whether the sleep was interrupted or not.
5.3.3DOMXPath::evaluateThe registerNodeNS parameter was added.
 DOMXPath::queryThe registerNodeNS parameter was added.
 json_encodeJSON_NUMERIC_CHECK option was added.
 ldap_sasl_bindSupport on Windows was added.
 openssl_decryptThe iv parameter was added.
 openssl_encryptThe iv parameter was added.
 parse_urlRemoved the E_WARNING that was emitted when URL parsing failed.
5.3.2 (PECL OCI8 1.4)oci_set_prefetchBefore this release, rows must be >= 1.
5.3.2cryptFixed Blowfish behaviour on invalid rounds to return "failure" string ("*0" or "*1"), instead of falling back to DES.
 cryptAdded SHA-256 and SHA-512 crypt based on Ulrich Drepper's implementation.
 flockThe automatic unlocking when the file's resource handle is closed was removed. Unlocking now always has to be done manually.
 gmp_initThe base was extended from 2 to 36, to 2 to 62 and -2 to -36.
 gmp_strvalThe base was extended from 2 to 36, to 2 to 62 and -2 to -36.
 imap_appendAdded INTERNALDATE support to imap_append.
 imap_openparams added
5.3.1get_defined_constantsWindows only: Core constants are categorized under Core, previously mhash.
 ibase_queryOn success the function now returns TRUE if there were no affected rows, where it previously returned 0 (a zero followed by an empty space).
 renamerename can now rename files across drives in Windows.
5.3.0 (PECL OCI8 1.3.4)oci_set_prefetchBefore this release, prefetching was limited to the lesser of rows rows and 1024 * rows bytes. The byte size restriction has now been removed.
5.3.0DateTime::__constructIf an invalid date is specified, then an exception is now thrown. Previously an error was emitted.
 DateTime::modifyChanged the return value on success from NULL to DateTime.
 DateTime::setDateChanged the return value on success from NULL to DateTime.
 DateTime::setISODateChanged the return value on success from NULL to DateTime.
 DateTime::setTimeChanged the return value on success from NULL to DateTime.
 DateTime::setTimezoneChanged the return value on success from NULL to DateTime.
 DateTimeZone::getTransitionsThe optional timestamp_begin and timestamp_end were added.
 DateTimeZone::listIdentifiersAdded the optional what and country parameters.
 DirectoryIterator::__constructThrows UnexpectedValueException if the path cannot be opened.
 acoshThis function is now available on all platforms
 array_key_existsThis function doesn't work with objects anymore, property_exists should be used in this case.
 array_reduceChanged initial to allow mixed, previously integer.
 asinhThis function is now available on all platforms
 atanhThis function is now available on all platforms
 call_user_funcThe interpretation of object oriented keywords like parent and self has changed. Previously, calling them using the double colon syntax would emit an E_STRICT warning because they were interpreted as static.
 call_user_func_arrayThe interpretation of object oriented keywords like parent and self has changed. Previously, calling them using the double colon syntax would emit an E_STRICT warning because they were interpreted as static.
 checkdnsrrThis function is now available on Windows platforms.
 clearstatcacheAdded optional clear_realpath_cache and filename parameters.
 copyAdded context support.
 cryptPHP now contains its own implementation for the MD5 crypt, Standard DES, Extended DES and the Blowfish algorithms and will use that if the system lacks of support for one or more of the algorithms.
 date_default_timezone_setNow throws E_WARNING rather than E_STRICT.
 define_syslog_variablesThis function now throws an E_DEPRECATED notice.
 dldl is now disabled in some SAPIs due to stability issues. The only SAPIs that allow dl are CLI and Embed. Use the Extension Loading Directives instead.
 dns_get_recordThis function is now available on Windows platforms.
 dns_get_recordPrior to this release, if the authns parameter was given, the addtl parameter was also required.
 error_reportingE_DEPRECATED and E_USER_DEPRECATED introduced.
 exif_imagetypeAdded icon support.
 expm1This function is now available on all platforms
 fgetcsvThe escape parameter was added
 fnmatchThis function is now available on Windows platforms.
 func_get_argIf this function is called from the outermost scope of a file which has been included by calling include or require from within a function in the calling file, it now generates a warning and returns FALSE.
 func_get_argThis function can now be used in parameter lists.
 func_get_argsIf this function is called from the outermost scope of a file which has been included by calling include or require from within a function in the calling file, it now generates a warning and returns FALSE.
 func_get_argsThis function can now be used in parameter lists.
 func_num_argsIf this function is called from the outermost scope of a file which has been included by calling include or require from within a function in the calling file, it now generates a warning and returns -1.
 func_num_argsThis function can now be used in parameter lists.
 gd_infoJPG Support attribute renamed to JPEG Support.
 get_cfg_varget_cfg_var was fixed to be able to return "array" ini options.
 get_classNULL became the default value for object, so passing NULL to object now has the same result as not passing any value.
 get_defined_constantsCore constants are categorized under Core, previously internal. On Windows, the Core Constants are categorized under mhash.
 get_object_varsThis function now returns NULL if the object isn't an object. Previously FALSE was returned.
 getimagesizeAdded icon support.
 getmxrrThis function is now available on Windows platforms.
 getoptParameter longopts is available on all systems.
 getoptAdded support for "=" as argument/value separator.
 getoptAdded support for optional values (specified with "::").
 getoptThis function is no longer system dependent, and now works on Windows, too.
 htmlentitiesThe constant ENT_IGNORE was added.
 htmlspecialcharsThe constant ENT_IGNORE was added.
 imagecolorclosesthwbThis function is now available on Windows
 imagefilterPixelation support (IMG_FILTER_PIXELATE) was added.
 inet_ntopThis function is now available on Windows platforms.
 inet_ptonThis function is now available on Windows platforms.
 ini_get_allAdded details.
 is_aThis function is no longer deprecated, and will therefore no longer throw E_STRICT warnings.
 json_decodeAdded the optional depth. The default recursion depth was increased from 128 to 512
 json_encodeThe options parameter was added.
 linkThis function is now available on Windows platforms (Vista, Server 2008 or greater).
 linkinfoThis function is now available on Windows platforms (Vista, Server 2008 or greater).
 log1pThis function is now available on all platforms
 mb_get_infoThe entry "http_output_conv_mimetypes" was made available.
 mcrypt_create_ivMCRYPT_DEV_RANDOM and MCRYPT_DEV_URANDOM became available on Windows platforms.
 mcrypt_create_ivIt is no longer required to call srand first. This is now done automatically.
 mktimemktime now throws E_DEPRECATED notice if the is_dst parameter is used.
 mysql_db_queryThis function now throws an E_DEPRECATED notice.
 mysql_escape_stringThis function now throws an E_DEPRECATED notice.
 nl2brAdded the optional is_xhtml parameter.
 parse_ini_fileAdded optional scanner_mode parameter. Single quotes may now be used around variable assignments. Hash marks (#) may no longer be used as comments and will throw a deprecation warning if used.
 pg_lo_createThe optional object_id was added.
 pg_lo_importThe optional object_id was added.
 preg_quoteThe - character is now quoted
 property_existsThis function checks the existence of a property independent of accessibility.
 rawurlencodeNow conforms to RFC 3986.
 readlinkThis function is now available on Windows platforms (Vista, Server 2008 or greater).
 realpathPrior to this release, if only the last path component did not exist, realpath would not fail on *BSD systems. realpath now fails in this case.
 register_tick_functionTicks are now supported on threaded web server modules.
 roundThe mode parameter was introduced.
 session_startIf a session fails to start, then FALSE is returned. Previously TRUE was returned.
 setlocaleThis function now throws an E_DEPRECATED notice if a string is passed to the category parameter instead of one of the LC_* constants.
 shm_attachThis function now returns a resource instead of an integer.
 socket_create_pairThis function is now re-enabled on Windows platforms.
 spl_autoload_registerNamespaces support was introduced.
 spl_autoload_registerThe prepend parameter was added.
 stream_context_createAdded the optional params argument.
 stream_socket_pairThis function is now available on Windows platforms.
 stristrAdded the optional parameter before_needle.
 strlenPrior versions treated arrays as the string Array, thus returning a string length of 5 and emitting an E_NOTICE level error.
 strstrAdded the optional parameter before_needle.
 strtotimePrior to PHP 5.3.0, 24:00 was not a valid format and strtotime returned FALSE.
 sybase_connectThe new parameter was added.
 symlinkThis function is now available on Windows platforms (Vista, Server 2008 or greater).
 time_nanosleepThis function is now available on Windows platforms.
 time_sleep_untilThis function is now available on Windows platforms.
 touchIt became possible to change the modification time of a directory under Windows.
 mysqli::__constructAdded the ability of persistent connections.
 mysqli::queryAdded the ability of async queries.
 ReflectionFunction::__constructname can now be a closure.
 SplObjectStorage::attachAdded the data parameter.
5.2.15 & 5.3.4mysqli_reportChanging the reporting mode is now be per-request, rather than per-process.
5.2.11get_defined_constantsThe categorize parameter now operates appropriately. Previously, the categorize parameter was interpreted as !is_null($categorize), making any value other than NULL force the constants to be categorized.
5.2.10array_randThe resulting array of keys is no longer shuffled.
 array_uniqueChanged the default value of sort_flags back to SORT_STRING.
 curl_setoptIntroduced CURLOPT_PROTOCOLS, and CURLOPT_REDIR_PROTOCOLS.
 ip2longPrior to this version, ip2long would sometimes return a valid number even if passed an value which was not an (IPv4) Internet Protocol dotted address.
 natsortZero padded numeric strings (e.g., '00005') now essentially ignore the 0 padding.
5.2.9array_uniqueAdded the optional sort_flags defaulting to SORT_REGULAR. Prior to 5.2.9, this function used to sort the array with SORT_STRING internally.
5.2.8XSLTProcessor::importStylesheetAccepts SimpleXMLElement again which was broken since PHP 5.2.6.
5.2.7error_logThe possible value of 4 was added to message_type.
 parse_ini_fileOn syntax error this function will return FALSE rather than an empty array.
 roundThe inner workings of round was changed to conform to the C99 standard.
 strtotimeIn PHP 5 prior to 5.2.7, requesting a given occurrence of a given weekday in a month where that weekday was the first day of the month would incorrectly add one week to the returned timestamp. This has been corrected in 5.2.7 and later versions.
5.2.6fopenThe 'c' and 'c+' options were added
5.2.5addcslashesThe escape sequences \v and \f were added.
 debug_backtraceAdded the optional parameter provide_object.
 imagefilterAlpha support for IMG_FILTER_COLORIZE was added.
5.2.4checkdnsrrTXT type was added.
 get_loaded_extensionsThe optional zend_extensions parameter was added
 ldap_first_attributeThe ber_identifier was removed. This is now handled automatically by PHP.
 ldap_next_attributeThe ber_identifier was removed. This is now handled automatically by PHP.
 parse_ini_fileKeys and section names consisting of numbers are now evaluated as PHP integers thus numbers starting by 0 are evaluated as octals and numbers starting by 0x are evaluated as hexadecimals.
 stream_wrapper_registerAdded the flags parameter.
5.2.3getimagesizeRead errors generated by this function downgraded to E_NOTICE from E_WARNING.
 htmlentitiesThe double_encode parameter was added.
 htmlspecialcharsThe double_encode parameter was added.
 json_decodeThe nesting limit was increased from 20 to 128
 XMLWriter::writeElementThe content parameter became optional.
 XMLWriter::writeElementNSThe content parameter became optional.
 PDOStatement::getColumnMetatable field
5.2.2 - 5.2.6substrIf the start parameter indicates the position of a negative truncation or beyond, false is returned. Other versions get the string from start.
5.2.2DOMDocument::registerNodeClassPrior to 5.2.2, a previously registered extendedclass had to be unregistered before being able to register a new class extending the same baseclass.
 ftp_ssl_connectThe function was changed to return FALSE when it can't use an SSL connection, instead of fallbacking to a non-SSL one as previously.
 phpinfoThe "Loaded Configuration File" information was added, when before only "Configuration File (php.ini) Path" existed.
 preg_matchNamed subpatterns now accept the syntax (?<name>) and (?'name') as well as (?P<name>). Previous versions accepted only (?P<name>).
 preg_match_allNamed subpatterns now accept the syntax (?<name>) and (?'name') as well as (?P<name>). Previous versions accepted only (?P<name>).
 proc_terminatePrevious versions used to destroy the given process resource.
 token_get_allLine numbers are returned in element 2
5.2.1iterator_to_arrayThe use_keys parameter was added.
 json_decodeAdded support for JSON decoding of basic types.
 memory_get_peak_usageCompiling with --enable-memory-limit is no longer required for this function to exist.
 memory_get_usageCompiling with --enable-memory-limit is no longer required for this function to exist.
 mt_srandThe Mersenne Twister implementation in PHP now uses a new seeding algorithm by Richard Wagner. Identical seeds no longer produce the same sequence of values they did in previous versions. This behavior is not expected to change again, but it is considered unsafe to rely upon it nonetheless.
 proc_openAdded the bypass_shell option to the other_options parameter.
5.2.0base64_decodestrict added
 curl_multi_info_readmsgs_in_queue was added.
 error_reportingE_RECOVERABLE_ERROR introduced.
 imagettftextIt is now possible to specify an hexadecimal entity in text.
 imap_openn_retries added
 imap_reopenn_retries added
 mb_strrposAdded the optional parameter offset.
 memory_get_peak_usagereal_usage was added.
 memory_get_usagereal_usage was added.
 openssl_verifyThe signature_alg parameter was added.
 pathinfoThe PATHINFO_FILENAME constant was added.
 pg_escape_byteaconnection added
 pg_escape_stringconnection added
 session_get_cookie_paramsThe "httponly" entry was added in the returned array.
 session_set_cookie_paramsThe httponly parameter was added.
 set_error_handlerThe error handler must return FALSE to populate $php_errormsg.
 setcookieThe httponly parameter was added.
 setrawcookieThe httponly parameter was added.
 snmp_set_oid_numeric_printSince PHP 5.2.0.
 PDOStatement::executeThe keys from input_parameters must match the ones declared in the SQL. Before PHP 5.2.0 this was silently ignored.
 SimpleXMLElement::childrenThe optional parameter is_prefix was added.
 SoapServer::SoapServerAdded the typemap option.
 SWFMovie::streamMP3skip added
 XMLReader::openencoding and options were added.
 XMLReader::XMLencoding and options were added.
5.1.3DirectoryIterator::__constructThrows RuntimeException if the path is an empty string.
 curl_getinfoIntroduced CURLINFO_HEADER_OUT.
 get_headersThis function now uses the default stream context, which can be set/changed with the stream_context_set_default function.
 http_build_querySquare brackets are escaped.
 imagecolorallocateReturns FALSE if the allocation failed. Previously -1 was returned.
 imagecolorallocatealphaReturns FALSE if the allocation failed. Previously -1 was returned.
 imagepngAdded the filters parameter.
 mb_get_infoThe entries "mail_charset", "mail_header_encoding", and "mail_body_encoding" were made available.
 SoapClient::__doRequestThe one_way parameter was added.
 XMLReader::getAttributeReturn NULL if no attribute found. Previously, returned an empty string.
5.1.2date_default_timezone_setThe function started to validate the timezone_identifier parameter.
 http_build_queryThe arg_separator parameter was added.
 imagepngAdded the quality parameter.
 parse_urlAdded the component parameter.
5.1.1dateThere are useful constants of standard date/time formats that can be used to specify the format parameter.
 debug_backtraceAdded the current object as a possible return element.
 gmdateThere are useful constants of standard date/time formats that can be used to specify the format parameter.
5.1.0DirectoryIterator::__constructThrows RuntimeException on error. Previously, threw Exception.
 DOMDocument::saveAdded the options parameter
 DOMDocument::saveXMLAdded the options parameter
 class_implementsAdded the option to pass the class parameter as a string. Added the autoload parameter.
 class_parentsAdded the option to pass the class parameter as a string. Added the autoload parameter.
 ctype_digitBefore PHP 5.1.0, this function returned TRUE when text was an empty string.
 curl_setoptIntroduced CURLOPT_AUTOREFERER, CURLOPT_BINARYTRANSFER, CURLOPT_FTPSSLAUTH, CURLOPT_PROXYAUTH, and CURLOPT_TIMECONDITION.
 dateNow issues the E_STRICT and E_NOTICE time zone errors.
 dateThe valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer). However, before PHP 5.1.0 this range was limited from 01-01-1970 to 19-01-2038 on some systems (e.g. Windows).
 date_sunriseNow issues the E_STRICT and E_NOTICE time zone errors.
 date_sunsetNow issues the E_STRICT and E_NOTICE time zone errors.
 explodeSupport for negative limits was added
 file_get_contentsAdded the offset and maxlen parameters.
 file_put_contentsAdded support for LOCK_EX and the ability to pass a stream resource to the data parameter
 gettimeofdayThe return_float parameter was added.
 globGLOB_ERR was added
 gmdateThe valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer). However, before PHP 5.1.0 this range was limited from 01-01-1970 to 19-01-2038 on some systems (e.g. Windows).
 gmmktimeAs of PHP 5.1.0, the is_dst parameter became deprecated. As a result, the new timezone handling features should be used instead.
 idateNow issues the E_STRICT and E_NOTICE time zone errors.
 imagerotateignore_transparent was added.
 intvalThrows E_NOTICE and returns 1, when an object is passed to var.
 localtimeNow issues the E_STRICT and E_NOTICE time zone errors.
 md5_fileChanged the function to use the streams API. It means that you can use it with wrappers, like md5_file('http://example.com/..')
 mktimeThe is_dst parameter became deprecated. Made the function return FALSE on error, instead of -1. Fixed the function to accept the year, month and day to be all passed as zero.
 mktimeNow issues the E_STRICT and E_NOTICE time zone errors.
 mktimeWhen called with no arguments, mktime throws E_STRICT notice. Use the time function instead.
 openssl_pkcs7_verifyThe content parameter was added.
 preg_replaceAdded the count parameter
 preg_replace_callbackThe count parameter was added
 session_regenerate_idAdded the delete_old_session parameter.
 sha1_fileChanged the function to use the streams API. It means that you can use it with wrappers, like sha1_file('http://example.com/..')
 sqlite_execAdded the error_msg parameter
 sqlite_fetch_column_typesAdded result_type
 sqlite_queryAdded the error_msg parameter
 sqlite_unbuffered_queryAdded the error_msg parameter
 str_word_countAdded the charlist parameter
 stream_copy_to_streamAdded the offset parameter
 stream_filter_appendPrior to PHP 5.1.0, this function returns TRUE on success or FALSE on failure.
 stream_filter_prependPrior to PHP 5.1.0, this function returns TRUE on success or FALSE on failure.
 stream_get_contentsThe offset was added.
 strftimeNow issues the E_STRICT and E_NOTICE time zone errors.
 strtotimeNow issues the E_STRICT and E_NOTICE time zone errors.
 strtotimeNow returns FALSE on failure, instead of -1.
 substr_compareAdded the possibility to use a negative offset.
 substr_countAdded the offset and the length parameters
 var_exportPossibility to export classes and arrays containing classes using the __set_state() magic method.
 XSLTProcessor::registerPHPFunctionsThe restrict parameter was added.
5.0.5php_check_syntaxThis function was removed from PHP.
5.0.4sqlite_keyPrior to PHP 5.0.4, sqlite_key was only able to be called as a method on a SQLiteResult object, not procedurally.
5.0.3get_class_varsDepending on the scope, get_class_vars will only return the properties that can be accessed from the current scope.
 is_subclass_ofYou may also specify the object parameter as a string (the name of the class)
 php_check_syntaxCalling exit after php_check_syntax resulted in a Segfault.
5.0.2array_sliceThe optional preserve_keys parameter was added.
 class_existsNo longer returns TRUE for defined interfaces. Use interface_exists.
 get_class_varsCalling get_class_vars will now expose all the properties as an array, unlike previous behaviour where protected and private properties were prefixed with nul bytes.
 strtotimeIn PHP 5 up to 5.0.2, "now" and other relative times are wrongly computed from today's midnight. This differs from other versions where it is correctly computed from current time.
5.0.1get_class_varsCalling get_class_vars will expose all properties, as when converting an object to a class.
 php_check_syntaxerror_message is passed by reference.
5.0.0apache_get_modulesBecame available when using Apache 1, or the PHP Apache 2 filter API. Before this time, it was only available when using the Apache 2 handler API.
 apache_get_versionBecame available with the Apache 2 filter API.
 array_keysAdded the strict parameter.
 array_mergeThe behavior of array_merge was modified in PHP 5. Unlike PHP 4, array_merge now only accepts parameters of type array. However, you can use typecasting to merge other types. See the example below for details. array_merge PHP 5 example <?php $beginning = 'foo'; $end = array(1 => 'bar'); $result = array_merge((array)$beginning, (array)$end); print_r($result); ?> The above example will output: Array ( [0] => foo [1] => bar )
 cal_infoThe calendar parameter becomes optional and defaults to "all calendars" if omitted.
 checkdnsrrAAAA type was added.
 class_existsThe autoload parameter was added.
 com_releaseThis function was removed.
 curl_setoptIntroduced CURLOPT_FTP_USE_EPRT, CURLOPT_NOSIGNAL, CURLOPT_UNRESTRICTED_AUTH, CURLOPT_BUFFERSIZE, CURLOPT_HTTPAUTH, CURLOPT_PROXYPORT, CURLOPT_PROXYTYPE, CURLOPT_SSLCERTTYPE, and CURLOPT_HTTP200ALIASES.
 dirnamedirname is now binary safe
 emptyObjects with no properties are no longer considered empty.
 error_reportingE_STRICT introduced (not part of E_ALL).
 extension_loadedextension_loaded uses the internal extension name to test whether a certain extension is available or not. Most internal extension names are written in lower case but there may be extensions available which also use uppercase letters. Prior to PHP 5, this function compared the names case sensitively.
 fgetssThe length parameter is optional
 fileThe context parameter was added
 filePrior to PHP 5.0.0 the flags parameter only covered include_path and was enabled with 1
 file_get_contentsAdded context support.
 file_put_contentsAdded context support
 get_classThe class name is returned in its original notation.
 get_classThe object parameter is optional if called from the object's method.
 get_class_methodsAs of PHP 5, this function returns the name of the methods as they were declared (case-sensitive). In PHP 4 they were lowercased.
 get_defined_constantsThe categorize parameter was added.
 get_defined_varsThe $GLOBALS variable is included in the results of the array returned.
 get_parent_classThe object parameter is optional if called from the object's method.
 html_entity_decodeSupport for multi-byte encodings was added.
 ip2longPrior to this version, ip2long returned -1 on failure.
 is_aThis function became deprecated in favour of the instanceof operator. Calling this function will result in an E_STRICT warning.
 is_executableis_executable became available with Windows
 jdtojewishThe fl parameter was added.
 mb_encode_mimeheaderThe indent parameter was added.
 mb_send_mailThe Content-Type and Content-Transfer-Encoding headers may be redefined as of PHP 5.0.0. Before this time, the values defined by mb_language are always used.
 md5The raw_output parameter was added.
 md5_fileAdded the raw_output parameter
 microtimeThe get_as_float parameter was added.
 mkdirAs of PHP 5.0.0 mkdir can also be used with some URL wrappers. Refer to for a listing of which wrappers support mkdir
 mkdirThe recursive parameter was added
 mysql_fetch_objectAdded the ability to return as a different object.
 opendirpath supports the ftp:// URL wrapper.
 openssl_pkcs7_encryptThe cipherid parameter was added.
 openssl_signThe signature_alg parameter was added.
 parse_ini_fileValues enclosed in double quotes can contain new lines.
 pg_fetch_objectclass_name and params were added. The old form with result_type still exists for backwards compatibility.
 proc_openAdded the cwd, env and other_options parameters.
 rangeThe optional step parameter was added.
 realpathPrior to this release, a blank or NULL path would cause realpath to return the directory name of the script.
 renamerename can now also be used with some URL wrappers. Refer to for a listing of which wrappers support rename.
 rmdirAs of PHP 5.0.0 rmdir can also be used with some URL wrappers. Refer to for a listing of which wrappers support rmdir.
 session_idThe , (comma) and - (minus) characters are allowed in the file session handler.
 set_error_handlerThe error_types parameter was introduced.
 sha1The raw_output parameter was added.
 sha1_fileAdded the raw_output parameter
 socket_createThe AF_INET6 constant was added.
 str_ireplaceThe count parameter was added.
 str_replaceThe count parameter was added.
 stream_get_meta_dataThe following entries were added in the returned array: mode, seekable, and uri.
 strip_tagsstrip_tags is now binary safe
 strrposThe needle may now be a string of more than one character.
 strrposThe offset parameter was introduced.
 strtotimeMicroseconds began to be allowed, but they are ignored.
 uniqidThe prefix parameter was made optional.
 unlinkAs of PHP 5.0.0 unlink can also be used with some URL wrappers. Refer to for a listing of which wrappers support unlink.
 usleepThis function now works on Windows systems.
 mysqli_result::fetch_objectAdded the ability to return as a different object.

Appendices
PHP Manual