PHP | ctype_digit() Function

PHP ctype_digit() 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_digit() Function.

PHP ctype_digit() function checks if all the characters in the provided string, text, are numerical. This function checks only 1 to 9.


Following below is the syntax to use this function -

ctype_digit ( $text );

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Parameter Details

Sr.NoParameters & Description


The tested string.

Return Value

This PHP function returns TRUE if every character in the text is a decimal digit, otherwise 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

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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_graph() Function.

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