Four methods to get the file extension

Source: Internet
Author: User
Tags explode extend

<? Php

Method 1

The code is as follows: Copy code
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:

The code is as follows: Copy code
Function extend_2 ($ file_name)
{
$ Extend = pathinfo ($ file_name );
$ Extend = strtolower ($ extend ["extension"]);
Return $ extend;
}


Method 3:

The code is as follows: Copy code
Function extend_3 ($ file_name)
{
$ Extend = explode (".", $ file_name );
$ Va = count ($ extend)-1;
Return $ extend [$ va];
}

 


Method 4:

The code is as follows: Copy code

Function extend_3 ($ file_name)
{
$ Extend = explode (".", $ file_name );
Return end ($ extend );
}

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