(PHP 4 >= 4.0.4, PHP 5)
ctype_punct — Check for any printable character which is not whitespace or an alphanumeric character
Checks if all of the characters in the provided string, text, are punctuation character.
The tested string.
Returns TRUE if every character in text is printable, but neither letter, digit or blank, FALSE otherwise.
Example #1 A ctype_punct() example 以上例程会输出：
<?php
$strings = array('ABasdk!@!$#', '!@ # $', '*&$()');
foreach ($strings as $testcase) {
if (ctype_punct($testcase)) {
echo "The string $testcase consists of all punctuation.
";
} else {
echo "The string $testcase does not consist of all punctuation.
";
}
}
?>
The string ABasdk!@!$# does not consist of all punctuation.
The string !@ # $ does not consist of all punctuation.
The string *&$() consists of all punctuation.
Note:
If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.