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.
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