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ctype_alnum

Check for alphanumeric character(s) (PHP 4 >= 4.0.4, PHP 5)
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].

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 416. 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 consist of all letters or digits.