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(PHP 4 >= 4.0.4, PHP 5)

ctype_alnum -- Check for alphanumeric character(s)

Description

bool ctype_alnum ( string text )

Checks if all of the characters in the provided string, text , are alphanumeric. In the standard C locale letters are just [A-Za-z] and the function is equivalent to preg_match('/^[a-z0-9]*$/i', $text) .

Parameters

text

The tested string.

Return Values

Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise.

Examples

Example 1. A ctype_alnum() example (using the default locale)

<?php
$strings = array('AbCd1zyZ9', 'foo!#$bar');
foreach ($strings as $testcase) {
    if (ctype_alnum($testcase)) {
        echo "The string $testcase consists of all letters or digits.\n";
    } else {
        echo "The string $testcase does not consist of all letters or digits.\n";
    }
}
?>

The above example will output:

The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consists of all letters or digits.

Related Function(s)

ctype_alpha()

ctype_digit()

setlocale()