ctype_alnum
(PHP 4 >= 4.0.4)
ctype_alnum -- Check for alphanumeric character(s)
Description
bool ctype_alnum ( string text)
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().
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