How to convert uppercase string to lowercase using PHP ?

The best way to convert uppercase string to lowercase in PHP is by using the strtolower() function. It takes the string as the input and converts it’s all characters to the lower case and returns the string value.

Syntax:

string strtolower( $string )

Return value: It returns the string converted into lower string.

Example 1:

PHP

<?php
  echo strtolower("GeeksForGeeks")
?>

Output:

geeksforgeeks

Example 2:

PHP

<?php
    $str = "Geeks For Geeks";
    $lowerStr = strtolower($str);
    echo $lowerStr
?>

Output:

geeks for geeks

Example 3:

PHP

<?php
    $str = "HelLo GeeKs hAve A wonDERful DaY";
    echo strtolower($str);
?>

Output:

hello geeks have a wonderful day