Saturday, November 14, 2020

PHP | ctype_alnum() Function

PHP ctype_alnum() Function

Hello dear readers! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP ctype_alnum() Function.

The PHP ctype_alnum() Function checks if all the characters in the string, text, are alphanumeric. In the standard C locale letters are just [A-Z, a-z] and the function is equivalent to the preg_match('/^[a-z0-9]+$/iD', $text).


Following below is the syntax to use this function -

ctype_alnum ( $text );

Parameter Details

Sr.NoParameters & Description


The tested string.

Return Value

This PHP function returns TRUE if every character in the text is either a letter or digit, otherwise FALSE.


Try out the below example -

   $strings = array('hello', 'foo!#$bar');
   foreach ($strings as $example) {
      if (ctype_alnum($example)) {
         echo "$example consists of all letters or digits. \n";
      }else {
         echo "$example does not have all letters or digits. \n";


When the above code is executed, it will produce the following result -

hello consists of all letters or digits.
foo!#$bar does not have all letters or digits.

RECOMMEDED POST: PHP | is_a() Function

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the PHP ctype_alpha() Function.

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