php curl memory usage

Question

I have this function that gets the html from a list of pages and once I run it for two hours or so the script interrupts and shows that memory limit has been exceeded, Now i've tried to unset/set to null some variables hopefully to free up some memory but it's the same problem. Can you guys please take a look at the following piece of code? :

{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    if ($proxystatus == 'on'){
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, TRUE);
        curl_setopt($ch, CURLOPT_PROXY, $proxy);
    }
    curl_setopt($ch, CURLOPT_COOKIEFILE, "cookie.txt");
    curl_setopt($ch, CURLOPT_URL, $site);
    ob_start();
    return curl_exec($ch); // the line the script interrupts because of memory
    ob_end_clean();
    curl_close($ch);

    ob_flush();
    $site = null;
    $ch = null;

}

Any suggestion is highly appreciated. I've set the memory limit to 128M, but before increasing it (doesnt seem like the best option to me) I would like to know if there's anything I can do to use less memory/free up memory while running the script.

Thank you.

Answer 1

You are indeed leaking memory. Remember that return immediately ends execution of the current function, so all your cleanup (most importantly ob_end_clean() and curl_close()) is never called.

return should be the very last thing the function does.