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Here’s an example of how to use strtolower() in PHP:
$string = "HELLO WORLD";
$lowercaseString = strtolower($string);
echo $lowercaseString; // outputs "hello world"
In this example, we start with a string that is all uppercase. We then use the strtolower() function to convert the string to lowercase and store the result in a new variable called $lowercaseString. Finally, we use the echo statement to output the lowercase string to the screen.
It’s important to note that the strtolower() function only works with ASCII characters. If you need to convert strings with non-ASCII characters to lowercase, you’ll need to use a different function, such as mb_strtolower().