php - How to ping two server address? -

i want have php code ping 2 servers if these servers online php code echo online

this code :

$ip = "ip1"; //ip or web address $port = "22"; //port $ip2 = "ip2"; //ip or web address $port2 = "22"; //port $sock = @fsockopen( $ip, $port, $num, $error, 5 ); //2 ping time, can sub need $sock2 = @fsockopen( $ip2, $port2, $num2, $error2, 5 ); //2 ping time, can sub need if( !$sock & !$sock2 ){ //do if closed     echo '<img title="offline" src="../images/down.png">';     } if( $sock & $sock2 ){ //do if open     echo '<img title="online" src="../images/up.png">';     fclose($sock);     fclose($sock2); } ?> 

is correct code ?

your code has few minor issues: if 1 sock open , other not, not close open socket (php close @ end of script anyway), because close them if both open. used binary , (&) instead of logical , && if( $sock && $sock2 ) {, , ending image tags /> idea make compliant every html flavour.

here multiserver version:

<?php      $servers_to_test=array(         array(             'ip'=>'192.168.100.1',             'port'=>22,             'timeout'=>5,         ),         array(             'ip'=>'192.168.100.101',             'port'=>22,             'timeout'=>5,         ),     );      $all_online=true;     $count_online=0;     $count_all=count($servers_to_test);     foreach($servers_to_test $aserver) {         $ip = $aserver['ip'];         $port = $aserver['port'];         $timeout = $aserver['timeout'];          $errnum=0;         $errstr='';          $sock = fsockopen( $ip, $port, $errnum, $errstr, $timeout );         if($sock!==false) {             fclose($sock1);             $count_online++;         } else $all_online=false;     }      if($all_online){         echo '<img alt="all online" title="all online" src="../images/up.png" />';     } else {         $perc=($count_all-$count_online).'/'.$count_all;         echo '<img alt="offline '.$perc.'" title="offline '.$perc.'" src="../images/down.png" />';     } ?> 

if test way many servers, take while, there ways make run tests in parallel webserver (without threads), have make single script test 1 server "seeifonline.php" (the server parameter url) , open script many times nonblocking sockets localhost,80 (they reply immediately) , manually writing 'get seeifonline.php?sever=$server' different $server each one. wait in loop replies. it's complicated works , can check status of 20 servers in same time 1 (5 seconds timeout). main difference know localhost server online, fsockopens localhost reply , launch script. script calls fsockopen 1 remote host, , it hangs till timeout, other scrips go on independent threads.