Programming Tips Three Ways to Get File Extensions in PHP_PHP Tutorial

Method 1:

<?php
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/371472.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/371472.htmlTechArticleMethod 1: ?php function extend_1($file_name) { $retval=; $pt=strrpos($file_name, .); if ($pt) $retval=substr($file_name, $pt+1, strlen($file_name) - $pt); return ($retval); } ? Square...