Four ways to get file extension PHP code _php tutorial

Three ways to get the file extension PHP tutorial code

//Method One:
function Extend_1 ($file _name)
{
$retval = "";
$pt =strrpos ($file _name, ".");
if ($pt) $retval =substr ($file _name, $pt +1, strlen ($file _name)-$pt);
return ($retval);
}

Method Two
PHP code

function Extend_2 ($file _name)
{
$extend = PathInfo ($file _name);
$extend = Strtolower ($extend ["extension"]);
return $extend;
}
function Extend_2 ($file _name) {$extend = PathInfo ($file _name); $extend = Strtolower ($extend ["extension"]); return $ Extend }

Method Three
PHP code

function Extend_3 ($file _name)
{
$extend =explode (".", $file _name);
$va =count ($extend)-1;
return $extend [$va];
}
function Extend_3 ($file _name) {$extend =explode (".", $file _name); $va =count ($extend)-1; return $extend [$va];}

Method Four
PHP code

function Getfileext ($file _name)
{
while ($dot = Strpos ($file _name, "."))
{
$file _name = substr ($file _name, $dot + 1);
}
return $file _name;
}
?>
function Getfileext ($file _name) {while ($dot = Strpos ($file _name, ".")) {$file _name = substr ($file _name, $dot + 1);} return $file _name; }?>

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