php process xml readfile

Question

Here https://stackoverflow.com/a/3673989/2118559 read that to get xml content better to use readfile , because it is the fastest.

I want to get and process content from here http://api.stopforumspam.org/api?ip=91.186.18.61

I did

readfile( "http://api.stopforumspam.org/api?ip=91.186.18.61" );

Then if result contains word no I will continue.

Like

if( strpos( 
readfile( "http://api.stopforumspam.org/api?ip=". urlencode(get_ip_address()) ),'no'     
) === true ){
echo ' continue<br>';
}

But it does not work. As understand readfile as if echo content of the file.

Do I need to use file_get_contents (can not do it with readfile )?

Edited

In above example I used wrong condition. Need for example !== false .

But remains problem that such code

readfile( "http://api.stopforumspam.org/api?ip=91.186.18.61" );

echo in my website content of xml file. like ip yes 2013-10-07 13:19:05 2

Do not need to echo (do not need to show visitor, that his ip address is in spam list or no)

Answer 1

use file_get_contents and !==false

try this

if( strpos(file_get_contents("http://api.stopforumspam.org/api?ip=". urlencode(get_ip_address()) ),'no') !== false ){
echo ' continue<br>';
}

Answer 2

You should use file_get_content

$data = file_get_contents("http://www.stopforumspam.com/api?ip=91.186.18.61");
$chk = strpos($data, 'yes');
if($chk === false)
{
    echo ' continue<br>';
}

I have checked the code its working.