Solution about file_get_contents returning empty or the function is unavailable

Solution about file_get_contents returning empty or the function is unavailable_PHP tutorial

WBOY

Release： 2016-07-21 15:03:54

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If you use file_get_contents to obtain the contents of a remote file and the result is empty or the function is unavailable, maybe this article can help you!
Using file_get_contents and fopen must enable allow_url_fopen. Method: Edit php.ini and set allow_url_fopen = On. When allow_url_fopen is turned off, neither fopen nor file_get_contents can open remote files. If you are using a virtual host, consider using the curl function instead.
Usage example of curl function:

Copy code The code is as follows:

$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, 'http://www.jb51.net');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);

Use the function_exists function to determine whether PHP supports it file_get_contents, otherwise use the curl function instead.
PS
1. If your hosting service provider has also turned off curl, then you should change the hosting provider!
2. Setting allow_url_fopen to off does not mean that your host does not support the file_get_content function. I just can't open the remote file. function_exists('file_get_contents') returns true. Therefore, the "Solution to the unavailability of file_get_contents function" circulated on the Internet still cannot solve the problem.
Error code:

Copy code The code is as follows:

if (function_exists('file_get_contents ')) {
$file_contents = @file_get_contents($url);
}else{
$ch = curl_init();
$timeout = 30;
curl_setopt($ch, CURLOPT_URL , $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ ch);
}

should be changed to:

Copy code The code is as follows:

if (function_exists('file_get_contents')) {//Determine whether file_get_contents is supported
$file_contents = @file_get_contents($url);
}
if ($file_contents == ”) {//Determine whether $file_contents is empty
$ch = curl_init();
$timeout = 30;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch , CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);
}

Final code:

Copy code The code is as follows:

function file_get_content($url ) {
if (function_exists('file_get_contents')) {
$file_contents = @file_get_contents($url);
}
if ($file_contents == ”) {
$ch = curl_init();
$timeout = 30;
curl_setopt($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;
}

Usage:
echo file_get_content('http://www.jb51.net');