<?php
//all uppercase letters
print(strtoupper("the quick brown fox jumps over the lazy dog."));
//all lowercase letters
print(strtolower("THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"));
// make a string's first character uppercase
print(ucfirst("the quick brown fox jumps over the lazy dog."));
// make a string's first character of all the words uppercase
print(ucwords("the quick brown fox jumps over the lazy dog."));
?>
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.the quick brown fox jumps over the lazy dogThe quick brown fox jumps over the lazy dog.The Quick Brown Fox Jumps Over The Lazy Dog.