PHP | ctype_cntrl() 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_cntrl() Function.

The built-in ctype_cntrl() function checks if all the character in the given string, text, are control characters. The example of control characters are line feed, escape, tab.

Syntax

Following below is the syntax to use this function -

ctype_cntrl ( $text );

READ: PHP | ctype_alpha() Function

Parameter Details

Sr.No	Parameters & Description
1	text(Required) The tested string.

Return Value

This built-in function returns TRUE if all the characters in the text is a control character from the current locale, FALSE otherwise.

Example

Try out the below example -

<?php
   $strings = array('\n\r\t', 'example1234r');
   
   foreach ($strings as $test) {
      if (ctype_cntrl($test)) {
         echo "$test consists of all control characters. \n";
      }else {
         echo "$test does not have all all control characters. \n";
      }
   }
?> 

Output

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

n\r\t does not have all all control characters.
example1234r does not have all all control characters.

READ: PHP | ctype_alnum() Function

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_digit() Function.

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