PHP error message failed to open stream: HTTP request failed! The perfect solution_PHP tutorial

Google or Baidu, there are many such problems, the solution is to modify php.ini, enable allow_url_fopen, change allow_url_fopen = On

This can solve some people's problems, some people say that in php In .ini, there are two options: allow_url_fopen =on (indicates that remote files can be opened through url), user_agent="PHP" (indicates which script is used to access the network, and there is a ";" in front of the default. Just remove it.) Restart server.

But some people still have this warning message. There is still one step left to achieve a perfect solution. You have to set the user_agent in php.ini. The default user_agent in php is PHP. We changed it to Mozilla/4.0 ( compatible; MSIE 6.0; Windows NT 5.0) to simulate the browser

user_agent=”Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)”

Encountered at work This problem was finally solved perfectly, so I share it with everyone.
I grabbed the structural formula of chemblink in batches and found that some pictures could not be displayed after the loop, but the remote files existed.
When grabbing remote files, a warning message similar to Warning: readfile(http://www.jb51.net/logo.gif) [function.readfile]: failed to open stream: HTTP request failed! appeared. I The code used is

copy code The code is as follows:

ob_start();
readfile("http://www .jb51.net/logo.gif");
$img = ob_get_contents();
ob_end_clean();

The above error will appear from time to time during operation. , I also changed other functions such as file_get_contents but it didn’t work. After checking on the Internet, I found that using the CURL method to capture will not go wrong

It is now more popular to use curl

Copy the code The code is as follows:

$url = "http://s.jb51.net";
$ch = curl_init( );
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT,10); $ch);
echo $dxycontent;
?>

http://www.bkjia.com/PHPjc/323600.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/323600.htmlTechArticleGoogle or Baidu, there are many such problems, the solution is to modify php.ini and enable allow_url_fopen , change to allow_url_fopen = On. This can solve some people's problems...