php to upper case and exclamation mark code example

Example 1: php uppercase

//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"

Example 2: php open file capital letters or not

$result = current(preg_grep("/".preg_quote($filename)."/i", glob("$path/*")));