how tdo you convert a stringto lowercase in php

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strtolower php -

strtolower ( string $string ) : string 
//Returns string with all alphabetic characters converted to lowercase.
$string = 'HELLO WORLD';
echo strtolower($string); //Output: 'hello world'
$string = 'HeLlO WoRlD';
echo strtolower($string); //Output: 'hello world'

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