Five ways to request url in php

This article mainly introduces the five methods of requesting URLs in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

Five methods:

• The first three are the basic file operation functions of PHP

• curl() is a PHP extension that needs to be enabled and installed under Linux.

• exec() is executed The command wget under the linux command line downloads remote files

. The wget command failed when testing the local virtual machine to request http://www.baidu.com, but failed on the remote server. Yes, considering the problem of DNS resolution, I directly requested the IP and successfully downloaded the index.html file.

Only methods are provided here. The advantages and disadvantages require a detailed understanding of the functions and defects of each method.

1. fopen() function

$file = fopen("http://www.jb51.net", "r") or die("打开远程文件失败!");
while (!feof($file)) {
 $line = fgets($file, 1024);
 //使用正则匹配标题标记
 if (preg_match("/<title>(.*)<\/title>/i", $line, $out)) {
 $title = $out[1]; //将标题标记中的标题字符取出
 break; //退出循环，结束远程文件读取
 }
}
fclose($file);

2 , file() function

$lines = file("http://www.jb51.net/article/48866.htm");
readfile(http://www.jb51.net/article/48866.htm);

##3. file_get_contents() function

$content = file_get_contents(http://www.jb51.net/article/48866.htm);

##4. Curl() requests remote url data

$url = "http://www.baidu.com";
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$contents = curl_exec($ch);
curl_close($ch);

5. exec() executes the command line command##

//exec("wget 220.181.111.188");
shell_exec("wget 220.181.111.188");

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