Ctype 函数
PHP Manual

ctype_graph

(PHP 4 >= 4.0.4, PHP 5)

ctype_graphCheck for any printable character(s) except space

说明

bool ctype_graph ( string $text )

Checks if all of the characters in the provided string, text, creates visible output.

参数

text

The tested string.

返回值

Returns TRUE if every character in text is printable and actually creates visible output (no white space), FALSE otherwise.

范例

Example #1 A ctype_graph() example

<?php
$strings 
= array('string1' => "asdf\n\r\t"'string2' => 'arf12''string3' => 'LKA#@%.54');
foreach (
$strings as $name => $testcase) {
    if (
ctype_graph($testcase)) {
        echo 
"The string '$name' consists of all (visibly) printable characters.\n";
    } else {
        echo 
"The string '$name' does not consist of all (visibly) printable characters.\n";
    }
}
?>

以上例程会输出:

The string 'string1' does not consist of all (visibly) printable characters.
The string 'string2' consists of all (visibly) printable characters.
The string 'string3' consists of all (visibly) printable characters.

注释

Note:

如果给出一个 -128 到 255 之间(含)的整数, 将会被解释为该值对应的ASCII字符 (负值将加上 256 以支持扩展ASCII字符). 其它整数将会被解释为该值对应的十进制字符串.

参见


Ctype 函数
PHP Manual