What are the several ways to get the url extension in php

Obtaining method: 1. Use the "substr(strrchr($url,"."),1)" statement; 2. Use "substr($url,strrpos($url,'.') 1) " statement; 3. Use "pathinfo($url,PATHINFO_EXTENSION)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php gets url extension Name method

Method 1:

<?php
$url="http://localhost/user/order.php";
function get_ext1($url){
	return substr(strrchr($url,"."),1);
}
echo get_ext1($url);
?>

Method 2:

<?php
$url="http://localhost/user/order.php";
function get_ext2($url){
	$p=pathinfo($url);//Array ( [dirname] => http://localhost/user [basename] => order.php [extension] => php [filename] => order )
	return $p[&#39;extension&#39;];
}
echo get_ext2($url);
?>

Method 3:

<?php
$url="http://localhost/user/order.php";
function get_ext3($url){
	return substr($url,strrpos($url,&#39;.&#39;)+1);
}
echo get_ext3($url);
?>

Method 4:

<?php
$url="http://localhost/user/order.php";
function get_ext4($url){
	$arr=explode(&#39;.&#39;,$url);
	return array_pop($arr);
}
echo get_ext4($url);
?>

Method 5:

<?php
$url="http://localhost/user/order.php";
function get_ext5($url){
	return pathinfo($url,PATHINFO_EXTENSION);
}
echo get_ext5($url);
?>

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