Three ways to get file extension in php_PHP tutorial

Copy code The code is as follows:

//Method 1:
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 2
function extend_2($file_name)
{
$ extend = pathinfo($file_name);
$extend = strtolower($extend["extension"]);
return $extend;
}

//Method 3
function extend_3($file_name)
{
$extend =explode("." , $file_name);
$va=count($extend)-1;
return $extend[$va];
}
?>

http://www.bkjia.com/PHPjc/317049.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/317049.htmlTechArticleCopy the code as follows: ?php //Method 1: functionextend_1($file_name) { $retval=""; $pt=strrpos($file_name,"."); if($pt)$retval=substr($file_name,$pt+1,strlen($file_name)-$pt);...