submitted string lowercase with strtolower() before invoking ucwords():

 
<?php
$full_name = "tHis IS a tESt";
$full_name =  ucwords( strtolower($full_name) );
print $full_name; 
?>

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

submitted string lowercase with strtolower() before invoking ucwords(): : ucwords « String « PHP