PHP - Function ctype_lower()

Syntax

ctype_lower ( $text );

Definition and Usage

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

Parameters

Return Value

It returns TRUE if every character in text is a lowercase letter in the current locale.

Example

Try out following example −

<?php
   $strings = array('aac123', 'testing', "testin IS Done");
   
   foreach ($strings as $test) {
      if (ctype_lower($test)) {
         echo "$test consists of all lowercase letters. \n";
      }else {
         echo "$test does not have all lowercase letters. \n";
      }
   }
?> 

This will produce the following result −

aac123 does not have all lowercase letters.
testing consists of all lowercase letters.
testin IS Done does not have all lowercase letters.