PHP Uptime check

admin — Mon, 24 Nov 2008 21:49:33 +0000

I found a useful script in PHP that can be used for checking uptime of a server. It can be useful for checking when the servers have a such a significant load that pages can’t be displayed. The benefit or running it locally is that I can configure the script to perform failover functionality if necessary. Online uptime services are good too, but most of them aren’t free. Maybe I should force the server to show a failwhale when the site gets too busy… j/k

Here’s the link to the script.
http://www.programmingtalk.com/showthread.php?t=34999

// the URL you want to keep tabs on $url = 'http://www.somewebsite.com';


// if not available, send email

if ( url_exists( $url ) === FALSE )

{

    $to   = 'my@email.com';

    $subj = $url . ' is down!';

    $msg  = $url . ' was tested at ' . date( 'Y-m-d H:i:s' ) . ' and was inaccessible.';

    @mail( $to, $subj, $msg );

} 
/**

 * url_exists()

 * Checks for the validity of a given URL

 *

 * @param string The http[s] URL you're checking for

 * @return bool TRUE if online; FALSE if not; NULL if not an http(s):// URL

 */

function url_exists( $strURL = NULL )

{

    if ( !preg_match( '/^http(s?):\/\//i', $strURL, $m ) )

        return NULL;

    @$ch = curl_init();

    curl_setopt( $ch, CURLOPT_URL, $strURL );

    curl_setopt( $ch, CURLOPT_BINARYTRANSFER, 1 );

    curl_setopt( $ch, CURLOPT_HEADERFUNCTION, 'curlHeaderCallback' );

    curl_setopt( $ch, CURLOPT_FAILONERROR, 1 );

    curl_setopt( $ch, CURLOPT_TIMEOUT, 5 );

    // https?

    if ( $m[1] == 's' )

        curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, 0 );

    @curl_exec( $ch );

    $intReturnCode = curl_getinfo( $ch, CURLINFO_HTTP_CODE );

    curl_close( $ch );

    return ( $intReturnCode == 200 OR $intReturnCode == 302 OR $intReturnCode == 304 ) ? TRUE : FALSE;

}

?>

Albertech.net » uptime

PHP Uptime check