Syntax
| ctype_alnum ( $text ); |
Definition and Usage
Checks if all of the characters in the provided string, text, are alphanumeric. In the standard C locale letters are just [A-Za-z] and the function is equivalent to preg_match('/^[a-z0-9]+$/iD', $text).
Paramters
| Parameter | Description |
|---|---|
| text | Required. The tested string. |
Return Value
Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise.
Example
Try out following example:
<?php
$strings = array('AbCd1zyZ9', 'foo!#$bar');
foreach ($strings as $testcase) {
if (ctype_alnum($testcase)) {
echo "$testcase consists of all letters or digits.<br />";
} else {
echo "$testcase does not have all letters or digits.<br />";
}
}
?>
|
This will produce following result:
AbCd1zyZ9 consists of all letters or digits. foo!#$bar does not have all letters or digits. |
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