How to Change a String to All Uppercase Letters in PHP?

Problem:

You have a string which has all the letters in lowercase or few letters in lowercase. You want to change the string to all uppercase letters.

Solution:

Use mb_strtoupper() function to convert all the lowercase letters to uppercase letters. See the following example-

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<?php $string = "To iterate is human, to recurse divine."; echo "Original string: ". $string. "<br />"; $string = mb_strtoupper($string); echo "Converted string: ". $string; ?>

Output:Original string: To iterate is human, to recurse divine.
Converted string: TO ITERATE IS HUMAN, TO RECURSE DIVINE.