One line of code in PHP gets the file suffix name

Source: Internet
Author: User
Tags extend trim

PHP a line of code to get the file suffix name of the method to combine a lot of functions, we are a bit like the function of ASP, let's take a look at the next.

Instance:

The code is as follows

$filename = ' D:/wamp/www/sparkphp/rar ';
$rs = Strtolower (Trim (substr (STRRCHR ($filename, "."), 1));

Detailed

The STRRCHR () function looks for the last occurrence of the string in another string and returns all characters from that position to the end of the string;
The substr () function is a part of the return string, and 1 represents the first read from the bottom of the string. Until the end;
The trim () function is to remove the space before and after the string;
The Strtolower () function converts a string to lowercase.

Add other methods

code as follows  

<?php
//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
function extend_2 ($file _name)
{
$extend = pathinfo ($file _name);
$extend = Strtolower ($extend ["extension"]);
return $extend;
}

//Method three
function extend_3 ($file _name)
{
$extend =explode (".", $file _name);
$va =count ($exte nd)-1;
return $extend [$va];
}

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