PHP - Function ctype_upper()

Syntax

ctype_upper ( $text );

Definition and Usage

This function checks if all of the characters in the provided string, text, are uppercase characters.

Parameters

Return Value

It returns TRUE if every character in text is an uppercase letter in the current locale.

Example

Try out following example −

<?php
   $strings = array('test12345', 'ABCEFG');
   
   foreach ($strings as $test) {
      if (ctype_upper($test)) {
         echo "$test consists of all uppercase letters. \n";
      }else {
         echo "$test does not have all uppercase letters. \n";
      }
   }
?> 

This will produce following result −

test12345 does not have all uppercase letters.
ABCEFG consists of all uppercase letters.