Changed Functions

Several functions were given new, optional parameters in PHP 5.4:

PHP Core:

• Added the optional limit parameter to debug_backtrace() and debug_print_backtrace(), to limit the amount of stack frames returned.
• is_link() now works properly for symbolic links on Windows Vista or later. Earlier systems do not support symbolic links.

OpenSSL:

• Added a no padding option to the openssl_encrypt() and openssl_decrypt() functions.

Intl:

• idn_to_ascii() and idn_to_utf8() now take two extra parameters, one indicating the variant (IDNA 2003 or UTS #46) and another, passed by reference, to return details about the operation in case UTS #46 is chosen.