Execute, get remote code return: File

The weather finally cleared up, but the problem came. In the implementation of user data synchronization between two sites, when the use of PHP functions file_get_contents Crawl execution of remote pages, if the connection timeout will output a fatal error or rather slow, resulting in the following code can not run. Let's take a look at the PHP file_get_contents () function
Definitions and usage
the file_get_contents () function reads the entire file into a string.
As with file (), the difference is that file_get_contents () reads the file into a string.
The file_get_contents () function is the preferred method for reading the contents of a file into a string. Memory mapping technology is also used to enhance performance if supported by the operating system.
Grammar
file_get_contents (path,include_path,context,start,max_length) parameter description
Path required. Specify the files to read.
Include_path Optional. If you also want to search for files in include_path, you can set this argument to "1".
The context is optional. The environment that prescribes the file handle.
The context is a set of options that can modify the behavior of a stream. If NULL is used, it is ignored.
Start optional. Specify where to start reading in the file. This parameter is a new addition to PHP 5.1.
Max_length Optional. Specify the number of bytes read. This parameter is a new addition to PHP 5.1.
description
the support for the context is added by PHP 5.0.0.
For timeouts or pages that are slow, you can generally take two solutions:

I. Using file_get_contents () third parameter

Copy Code code as follows:


$url = "http://zhoz.com/zhoz.php";


$ctx = stream_context_create (Array (


' http ' => array (' timeout ' => 10)


)


);


$result = @file_get_contents ($url, 0, $ctx);


if ($result) {


Var_dump ($result);


}else{


echo "Buffer is empty";


}


?>

This method 1, I tested in the local reflection is good, but if the external network test (environment: China → United States server) is basically timeout situation.
Testing the timeout is basically useless, suggest the following ways

Two. Using the Curl Extension library

Copy Code code as follows:


$url = "http://zhoz.com/zhoz.php";


try {


echo Date (' y-m-d h:i:s ');


echo "";


//$buffer = file_get_contents ($url);


$buffer = zhoz_get_contents ($url);


echo Date (' y-m-d h:i:s ');


if (Emptyempty ($buffer)) {


echo "Buffer is empty";


} else {


echo "Buffer is not empty";


}


} catch (Exception $e) {


echo "Error";


}


function zhoz_get_contents ($url, $second = 5) {


$ch = Curl_init ();


curl_setopt ($ch, Curlopt_url, $url);


curl_setopt ($ch, curlopt_header,0);


curl_setopt ($ch, Curlopt_timeout, $second);


curl_setopt ($ch, Curlopt_returntransfer, true);


$content = curl_exec ($ch);


curl_close ($ch);


return $content;


}


?>

Review, according to the system environment to choose exactly which method to apply:

Copy Code code as follows:

Function Vita_get_url_content ($url) {
if (function_exists (' file_get_contents ')) {
$file _contents = File _get_contents ($url);
} else {
$ch = Curl_init ();
$timeout = 5;
curl_setopt ($ch, Curlopt_url, $url);
curl_setopt ($ch, Curlopt_returntransfer, 1);
curl_setopt ($ch, Curlopt_connecttimeout, $timeout);
$file _contents = curl_exec ($ch);
Curl_close ($ch);
}
return $file _contents;
}