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strtolower() Function in PHP

In PHP the strtolower() function is used to converts a string to lowercase.

strtolower(string)

<!DOCTYPE html>
<html>
<body>
<?php echo strtoupper("STUDENTS TUTORIAL!"); ?>
</body>
</html>

Output

students tutorial!

<!DOCTYPE html>
<html>
<body>
<?php echo strtoupper("WeLcoMe TO Students Tutorial!"); ?>
</body>
</html>

Output

welcome to students tutorial!