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19 years ago
Here's a ping function that uses sockets instead of exec().  Note: I was unable to get socket_create() to work without running from CLI as root.  I've already calculated the package's checksum to simplify the code (the message is 'ping' but it doesn't actually matter).

<?php

function ping($host) {
    $package = "\x08\x00\x19\x2f\x00\x00\x00\x00\x70\x69\x6e\x67";

    /* create the socket, the last '1' denotes ICMP */    
    $socket = socket_create(AF_INET, SOCK_RAW, 1);
    
    /* set socket receive timeout to 1 second */
    socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 1, "usec" => 0));
    
    /* connect to socket */
    socket_connect($socket, $host, null);
    
    /* record start time */
    list($start_usec, $start_sec) = explode(" ", microtime());
    $start_time = ((float) $start_usec + (float) $start_sec);
    
    socket_send($socket, $package, strlen($package), 0);
    
    if(@socket_read($socket, 255)) {
        list($end_usec, $end_sec) = explode(" ", microtime());
        $end_time = ((float) $end_usec + (float) $end_sec);
    
        $total_time = $end_time - $start_time;
        
        return $total_time;
    } else {
        return false;
    }
    
    socket_close($socket);
}

?>
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