str to letter capital in php code example

Example 1: string first letter uppercase php

<?php
$foo = 'hello world!';
$foo = ucfirst($foo);             // Hello world!

$bar = 'HELLO WORLD!';
$bar = ucfirst($bar);             // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
?>

Example 2: php change sting to caps

$lowercase = "this is lower case";
$uppercase = strtoupper($lowercase);

echo $uppercase;