PHP Function to format currency

Here is a function to format

function format_currency($curr){
$formated_value = number_format($curr, 2, '.', ',');
return $formated_value;
}

PHP function to get extension of a file

Here is a simple usefull function to get extension of a file

function getFileExtension($filename){
$dot = substr (strrchr ($filename, "."), 1);
return ($dot);
}

PHP function see if url exists

Here is an simple usefull function see if an url exists

function url_exists($url)
{
$handle = @fopen($url, "r");
if ($handle === false)
return false;
fclose($handle);
return true;
}