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Count online users
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-type" content="text/html; charset=utf-8"> | |
| <title>Pinger test</title> | |
| <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js" type="text/javascript" charset="utf-8"></script> | |
| </head> | |
| <body> | |
| <h1>Online user counter</h1> | |
| <p id="counter">Users online: <span id="userCount">loading…</span></p> | |
| <script type="text/javascript" charset="utf-8"> | |
| $().ready(function (){ | |
| var token = ''; | |
| var pinger = setInterval(function (){ | |
| $.ajax({ | |
| cache: false, | |
| data: { | |
| token: token, | |
| }, | |
| timeout: 2500, | |
| type: 'GET', | |
| url: 'pinger.php', | |
| dataType: 'json', | |
| success: function (data, status, jqXHR){ | |
| $('#userCount').text(data.userCount); | |
| token = data.token; | |
| } | |
| }); | |
| }, 5000); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| <?php | |
| // Look for token | |
| $token = (isset($_GET['token']) && preg_match('/^[0-9a-f]{8}$/', $_GET['token'])) ? $_GET['token'] : false; | |
| if (!$token) { | |
| $token = sprintf('%08x', crc32(microtime())); | |
| } | |
| // get current minute, build APC key | |
| $quadrant = ceil(date_create()->format('s') / 15); // between 1-4 | |
| $previousQuadrant = $quadrant - 1 < 1 ? 4 : $quadrant - 1; | |
| $key = 'pinger_'.$quadrant; | |
| $previousKey = 'pinger_'.$previousQuadrant; | |
| // get tokens for the last 30 seconds | |
| $current = apc_fetch($key); | |
| $previous = apc_fetch($previousKey); | |
| if (!is_array($current)) { | |
| $current = array(); | |
| } | |
| if (!is_array($previous)) { | |
| $previous = array(); | |
| } | |
| // Add current token if not found | |
| if (count($current) < 250 && !in_array($token, $current)) { | |
| $current[] = $token; | |
| apc_store($key, $current, 31); | |
| } | |
| // Build return object: userCount, token | |
| $output = array( | |
| 'userCount' => count($current) > 250 ? '250+' : count(array_unique(array_merge($current, $previous))), | |
| 'token' => $token, | |
| ); | |
| header('Content-Type: application/json'); | |
| print json_encode($output); | |
| exit; |
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