verify URL is live and running or not

I will be taking URL from user. Now I need to verify whether address is live or not.

For example:

If user enters "google.com", then I will pass "google.com" 开发者_高级运维as argument to some function, and function will return me TRUE if URL is live, upload and running, otherwise FALSE.

Any in-built function or some help.

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I'd suggest using get_headers($url) and checking to see if one of your responses contains "200 OK". If so, then the site is alive and responded with a valid request. You can also check for other status codes if you want, such as redirects and whatnot.

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function url_exists($url){
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch, CURLOPT_TIMEOUT,5);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT,5);
    curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);  
    return $code == 200;
}

You may want to support additional httpcodes such as 201, but that's up to you.

EDIT:

AS a note this gives you better control over the timeouts you want to use before failing.

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Try fopen

$f = @fopen('http://www.google.com/', 'r');
if (is_resource($f)) {
  fclose($f);
  return true;
} else { return false; }