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PHP | ctype_xdigit() Function

PHP ctype_xdigit() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP ctype_xdigit() Function.

The PHP ctype_xdigit() function checks if all the characters in the given string, text, are hexadecimal numbers.


Following below is the syntax to use this function -

ctype_xdigit ( $text );

Parameter Details

Sr.NoParameters & Description


The tested string.

Return Value

This built-in PHP function returns TRUE if all characters in the text is a hexadecimal number, that's a decimal digit or character from [A-Fa-f], otherwise FALSE.


Try out the below example -

   $strings = array('ABCDEF', 'SAI!@#$', 'ab12bc99');
   foreach ($strings as $test) {
      if (ctype_xdigit($test)) {
         echo "$test consists of all hexadecimal digits. \n";
      }else {
         echo "$test does not have all hexadecimal digits. \n";


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

ABCDEF consists of all hexadecimal digits.
SAI!@#$ does not have all hexadecimal digits.
ab12bc99 consists of all hexadecimal digits.

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP Date and Time Functions.

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