ctype_alnum
PHP function
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(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
Check for alphanumeric character(s)
Description
ctype_alnum(mixed $text): bool
Checks if all of the characters in the provided string, text, are alphanumeric.
Parameters
textThe tested string. Integer Non-string
Return Values
Returns true if every character in text is either a letter or a digit, false otherwise. Empty-string
Examples
A ctype_alnum() example (using the default locale)
php
<?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 $testcase does not consist of all letters or digits.\n";
}
}
?>The above example will output:
output
The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consist of all letters or digits.