为xml fopen设置PHP超时

While accessing xml file with fopen that don’t exist we get

failed to open stream: HTTP request failed!

But it takes 30 seconds. How to return this error immediately or short after not finding a file.

Also, why when file is not found Apache scans lots of ports?

I think this is the way, You have to use fopen itself to check whether it exists or not,

function fileExists($path){
     return (@fopen($path,"r")==true);
}

if(fileExists('http://example.com/test/file.xml'))
{ 
    echo "exists";
}
else
{
    echo "not_exist";
}