PHP How to get file extension _php tutorial

How PHP obtains the file name extension

In the work, often encounter need to get the file extension, here I give you the following several methods. (Welcome to criticize)

Method One

　　

function Getfileextend_1 ($fileName) {

$retval = "";

$pt =strtpos ($fileName, ".");

if ($pt) {

$retval =substr ($fileName, $pt +1,strlen ($fileName)-$pt);

}

if ($retval!== "") {

return $retval;

}

return false;

}

?>

Method Two

　　

function Getfileextend_2 ($fileName) {

$extend = PathInfo ($fileName);

$extend = Strtolower ($extend [' extension ']);

if (is_string ($extend)) {

return $extend;

}

return false;

}

?>

Method Three

　　

function Getfileextend_3 ($fileName) {

$extend =explode (".", $fileName);

$va =count ($extend)-1;

$extend = $extend [$va];

if (is_string ($extend)) {

return $extend;

}

return false;

}

?>

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