Comparative analysis of file_get_contents and curl performance in php

This article mainly introduces the performance comparison between file_get_contents and curl in PHP, and analyzes the difference between file_get_contents and curl in detail as well as the comparison of operating efficiency in the form of examples. Friends in need can refer to it

The examples in this article describe Comparative analysis of file_get_contents and curl performance in PHP. Share it with everyone for your reference. The details are as follows:

If you don’t analyze the performance carefully in PHP, you will find that file_get_contents and curl have a lot in common. They can both collect files and open files, but if you compare them carefully, you will find many differences. , let’s take a look at the difference between file_get_contents and curl.

The difference between fopen, file_get_contents, and curl functions in PHP:

1. fopen /file_get_contents will re-do the DNS query for each request and does not cache the DNS information. But CURL will automatically cache DNS information. Requests for web pages or images under the same domain name only require one DNS query. This greatly reduces the number of DNS queries. So the performance of CURL is much better than fopen /file_get_contents.

2.fopen /file_get_contents When requesting HTTP, http_fopen_wrapper is used and will not keeplive. But curl can. In this way, curl will be more efficient when requesting multiple links multiple times.

3.fopen / file_get_contents function will be affected by the allow_url_open option configuration in the php.ini file. If the configuration is turned off, this function will be disabled. Curl is not affected by this configuration.

4.curl can simulate a variety of requests, such as POST data, form submission, etc. Users can customize requests according to their own needs. And fopen/file_get_contents can only use the get method to obtain data.
file_get_contents When obtaining remote files, the results will be stored in a string, while the fiels function will store them in array form

Therefore, I still prefer to use curl to access the remote URL. Php has curl module extension, which is very powerful.

After talking for a long time, everyone may say that there is no comparison in performance, so let’s take a look

Recently we need to obtain music data from other people’s websites. I have used the file_get_contents function, but I always encounter the problem of failure to obtain it. Although I set the timeout according to the examples in the manual, it does not work most of the time:

Copy code The code is as follows:

$config['context'] = stream_context_create(array('http' => array('method' => "GET",
   'timeout' => 5//这个超时时间不稳定，经常不奏效
   )
));

At this time, if I look at the server's connection pool, I will find a bunch of similar errors, which gives me a headache:

file_get_contents(http://***): failed to open stream...
Now I use the curl library and write a function replacement:

Copy code The code is as follows:

function curl_file_get_contents($durl){
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $durl);
  curl_setopt($ch, CURLOPT_TIMEOUT, 5);
  curl_setopt($ch, CURLOPT_USERAGENT, _USERAGENT_);
  curl_setopt($ch, CURLOPT_REFERER,_REFERER_);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  $r = curl_exec($ch);
  curl_close($ch);
   return $r;
}

Like this, No more issues other than real network issues.
This is a test done by others about curl and file_get_contents:
The number of seconds it takes for file_get_contents to crawl google.com:
2.31319094
2.30374217
2.21512604
3.30553889
2.30124092
curl usage time:
0.68719101
0.64675593
0.64326
0.81983113
0.63956594

Is there a big difference? Haha, from my experience, these two tools are not only different in speed, but also in stability.

It is recommended that friends who have high requirements for the stability of network data capture use the curl_file_get_contents function above. Not only is it stable and fast, but it can also fake the browser and deceive the target address.

Look at another example

The comparison results of curl and file_get_contents are posted later. In addition to the performance comparison of curl and file_get_contents, it also includes their performance comparison. Before talking about it, take a look at the following result chart:

The performance comparison between curl and file_get_contents PHP source code is as follows:

Copy code The code is as follows:

code=='1'){ 
        return false; 
    } 
    $city = $ipinfo->data->region.$ipinfo->data->city; 
    return $city; 
} 
  
function getCity($ip) 
{ 
    $url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip; 
    $ipinfo=json_decode(file_get_contents($url)); 
    if($ipinfo->code=='1'){ 
        return false; 
    } 
    $city = $ipinfo->data->region.$ipinfo->data->city; 
    return $city; 
} 
  
// for file_get_contents 
$startTime=explode(' ',microtime()); 
$startTime=$startTime[0] + $startTime[1]; 
for($i=1;$i<=10;$i++) 
{ 
   echo getCity("121.207.247.202")."
"; 
} 
$endTime = explode(' ',microtime()); 
$endTime = $endTime[0] + $endTime[1]; 
$totalTime = $endTime - $startTime; 
echo 'file_get_contents:'.number_format($totalTime, 10, '.', "")." seconds
"; 
  
//for curl 
$startTime2=explode(' ',microtime()); 
$startTime2=$startTime2[0] + $startTime2[1]; 
for($i=1;$i<=10;$i++) 
{ 
   echo getCityCurl('121.207.247.202')."
"; 
} 
$endTime2 = explode(' ',microtime()); 
$endTime2=$endTime2[0] + $endTime2[1]; 
$totalTime2 = $endTime2 - $startTime2; 
echo "curl:".number_format($totalTime2, 10, '.', "")." seconds"; 
?>

Test access
file_get_contents speed: 4.2404510975 seconds
curl speed: 2.8205530643 seconds
curl is about 30% faster than file_get_contents. The most important thing is that the server load is lower.

Summary

When file_get_contents processing is frequent and small, it feels good to use it. Nothing unusual. If your file is processed by 1k people. Then your server CPU is waiting for a boost. Therefore, I recommend that you and everyone use the curl library when writing PHP code in the future.

Related recommendations:

thinkphp3.2 realizes the method of calling other modules across controllers

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