jquery - PHP long polling make my server hang -


i trying make facebook webpage messenger app , use ajax in client side , php on server side.

my ajax code:

function longpoll(timestamp) {     var querystring = {'timestamp' : timestamp};     var shoulddelay = false;      $.ajax(         {             type: 'get',             async: true,             url: 'pollmsg.php',             data: querystring,             timeout: 5000,             cache: false         }     ).done(function(data){         var array = jquery.parsejson(data);          (var = 0; < array.length; i++) {             $('#msgtable > tbody:last-child').append('<tr><td><b>' + array[i].sender + '</b><br/>' + array[i].timestamp + '</td><td><b>' + array[i].title + '</b><br/>' + array[i].content + '</td></tr>');         }          longpoll(obj.timestamp);     }).fail(function(jqxhr, textstatus, errorthrown) {         //shoulddelay = textstatus !== "timeout";     }).always(function() {         var delay = shoulddelay ? 5000: 0;         if (shoulddelay) {             shoulddelay = false;             window.settimeout(longpoll, delay);         }     }); }  // initialize jquery $(function() {     longpoll(); });

my php code:

//set php runtime unlimited set_time_limit(10); while (true) { $last_ajax_call = isset($_get['timestamp']) ? (int)$_get['timestamp'] : '1970-01-01 00:00:00';  $sql = "select * post (receiver = ? or sender = ?) , postat > str_to_date(?, '%y/%m/%d %h:%i:%s')"; $stmt   = $conn->prepare($sql); $stmt->bind_param("sss", $username, $username, $last_ajax_call);  $result = $stmt->execute(); $rows = $stmt->get_result()->fetch_all();  if (count($rows) > 0) {     $result = array();     foreach ($rows $row) {         $data = array (             'sender' => $row[3],             'timestamp' => $row[5],             'title' => $row[1],             'content' => $row[2]         );         array_push($result, $data);     }      $json = json_encode($result);     echo $json;      break; } else {     sleep( 1 );     continue; } }

i found if once click on page ajax code, when change other page in same webserver, nginx error (as use nginx).

what problem in code? have found example of long polling , gives me similar code. thank you.

when restart php-fpm, okay, means have generated many request server cannot handle.


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