/* strtolower() function converts string to lowercase. */
<?php
echo strtolower("Hello WORLD 123");
?>
// Output:hello world 123strtolower ( 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'strtolower ( string $string ) : string
//Returns string with all alphabetic characters converted to lowercase.
$string = 'HELLO WORLD';
echo strtolower($string); //Output: 'hello world'The strtolower() function is used to convert a string into lowercase. This function takes a string as parameter and converts all the uppercase english alphabets present in the string to lowercase.