get EXTENSION performance: preg_match vs pathinfo

test.php

<?php
    function microtime_float() 
 
    { 
 
        list($usec, $sec) = explode(" ", microtime()); 
 
        return ((float)$usec + (float)$sec); 
 
    } 
 
    $url = 'https://files.kn007.net/aw-lol-concert.flv?v=1';
       
 
    $start=microtime_float(); 

 
    for ($i = 3000000; $i > 0; $i--) {    
 
         preg_match("/\.(\w+)($|\?|\#)/",$url,$str);  
 
    }   
 
       
 
    $end = microtime_float(); 
 
   
 
   
 
    echo("<br/> t i m e :" .  round( $end - $start ,2) ."<br/>"); 
 
       
 
       
 
    $start=microtime_float(); 
 
 
    for ($i = 3000000; $i > 0; $i--) {    
 
        pathinfo( parse_url( $url, PHP_URL_PATH ), PATHINFO_EXTENSION );  
 
    }   
 
       
 
    $end = microtime_float(); 
 
   
 
   
 
    echo("<br/> t i m e :" .  round( $end - $start ,2) ."<br/>"); 
?>