Three php functions to obtain file suffix names

PHP obtains the file suffix. There are many ways to obtain the file extension. Here are three methods of obtaining the file suffix. You can study it. The specific code will not be explained. Just look at the code

Choose one and remember it. You can use it directly when you need to use it in the future, or you can come to this site to view this article.

The code is as follows:

<?php 
//方法一: 
function extend_1($file_name) 
{ 
$retval=""; 
$pt=strrpos($file_name, "."); 
if ($pt) $retval=substr($file_name, $pt+1, strlen($file_name) - $pt); 
return ($retval); 
} 

//方法二 
function extend_2($file_name) 
{ 
$extend = pathinfo($file_name); 
$extend = strtolower($extend["extension"]); 
return $extend; 
} 

//方法三 
function extend_3($file_name) 
{ 
$extend =explode("." , $file_name); 
$va=count($extend)-1; 
return $extend[$va]; 
} 
?>

The above is the detailed content of Three php functions to obtain file suffix names. For more information, please follow other related articles on the PHP Chinese website!