capitalize php

//string to all uppercase
$string = "String with Mixed use of Uppercase and Lowercase";
//php string to uppercase
$string = strtoupper($string);
// = "STRING WITH MIXED USE OF UPPERCASE AND LOWERCASE"ucfirst("hello world!");<?php
$foo = 'hello world!';
$foo = ucfirst($foo);             // Hello world!

$bar = 'HELLO WORLD!';
$bar = ucfirst($bar);             // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
?>
// string manipulation function 
$lowercase = "this is lower case";
$uppercase = strtoupper($lowercase);

echo $uppercase;<?php
/* Convert the first character of "hello" to uppercase:  */
echo ucfirst("hello samy!");

//output : Hello samy!
?>ucwords("hello world"); // Hello World
ucfirst("hello world"); // Hello world