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PHP | ctype_digit() Function

PHP ctype_digit() 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_digit() Function.

The PHP ctype_digit() function checks if all of the character in the given string, text, are numerical. This function checks only 1 to 9.


Following below is the syntax to use this function -

ctype_digit ( $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 decimal digit, else FALSE.


Try out the below example -

   $strings = array('122.50', '1004', 'foo!#$bar');
   foreach ($strings as $test) {
      if (ctype_digit($test)) {
         echo "$test consists of all digits. \n";
      }else {
         echo "$test does not have all digits. \n";


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

122.50 does not have all digits
1004 consists of all digits
foo!#$bar does not have all 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 ctype_graph() Function.

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