string ucwords ( string str ) converts the first letter of each word in the string to an uppercase character, leaving the others untouched.

 
<?
    $string = "i like to program in PHP";
    $a = strtoupper($string);
?>

1.	Controlling Case
2.	ucwords() function capitalizes the first letter of each word in a string.
3.	ucwords() makes the first letter of every word in a string uppercase.
4.	ucwords.php
5.	submitted string lowercase with strtolower() before invoking ucwords():
6.	Prettifying names with ucwords()

string ucwords ( string str ) converts the first letter of each word in the string to an uppercase character, leaving the others untouched. : ucwords « String « PHP