ctype_alnum

Description

Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise. In the standard C locale letters are just [A-Za-z] and the function is equivalent to preg_match('/^[a-z0-9]*$/i', $text).

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 $testcase does not consist of all letters or digits.\n";     } } ?> This example will output : The string AbCd1zyZ9 consists of all letters or digits. The string foo!#$bar does not consists of all letters or digits.

See also ctype_alpha(), ctype_digit(), and setlocale().