如何以及在何处使用长轮询脚本进行php查询_Php_Jquery_Mysql_Ajax

如何以及在何处使用长轮询脚本进行php查询

php jquery mysql ajax

如何以及在何处使用长轮询脚本进行php查询,php,jquery,mysql,ajax,Php,Jquery,Mysql,Ajax,我想使用长轮询来更新像facebook这样的墙贴下面是我使用的长轮询脚本，如果我在msgsrv.php中使用普通html文本，它会显示更改现在，我想进行一个php查询，然后添加新数据（如果在数据库如果我在msgsrv.php中添加php查询，则显示所有php代码。所以我认为我的查询在脚本或其他任何地方都不正确如何在长轮询脚本中进行php查询以及在何处进行查询，以在index.php中回显查询结果 index.php <script type="text/javascript" s

我想使用长轮询来更新像facebook这样的墙贴

下面是我使用的长轮询脚本，如果我在

msgsrv.php

中使用普通html文本，它会显示更改

现在，我想进行一个php查询，然后添加新数据（如果在数据库

如果我在

msgsrv.php

中添加php查询，则显示所有php代码。所以我认为我的查询在脚本或其他任何地方都不正确

如何在长轮询脚本中进行php查询以及在何处进行查询，以在index.php中回显查询结果

index.php

<script type="text/javascript" src="client.js"></script>
</head><body>
<div id="response"></div>
<body>

server.php

<?php
set_time_limit(0);

$data_source_file = 'msgsrv.php';

while (true) {

// if ajax request has send a timestamp, then $last_ajax_call = timestamp, else $last_ajax_call = null
$last_ajax_call = isset($_GET['timestamp']) ? (int)$_GET['timestamp'] : null;

// PHP caches file data, like requesting the size of a file, by default. clearstatcache() clears that cache
clearstatcache();
// get timestamp of when file has been changed the last time
$last_change_in_data_file = filemtime($data_source_file);

// if no timestamp delivered via ajax or msgsrv.php has been changed SINCE last ajax timestamp
if ($last_ajax_call == null || $last_change_in_data_file > $last_ajax_call) {

    // get content of msgsrv.php
    $data = file_get_contents($data_source_file);

    // put msgsrv.php's content and timestamp of last msgsrv.php change into array
    $result = array(
        'data_from_file' => $data,
        'timestamp' => $last_change_in_data_file
    );

    $json = json_encode($result);
    echo $json;

    break;

} else {
    sleep( 1 );
    continue;
}
}
?>

Interval应该用javascript而不是php设置。此外，您似乎没有根据时间戳调整查询。不确定您为什么要在这个场景中使用file\u get\u contents（）
先生，我用msgsrv.php
替换了data.txt文件。我的server.php和clint.js也是从web源代码收集的。我对这个代码也不是很了解。
<?php
set_time_limit(0);

$data_source_file = 'msgsrv.php';

while (true) {

// if ajax request has send a timestamp, then $last_ajax_call = timestamp, else $last_ajax_call = null
$last_ajax_call = isset($_GET['timestamp']) ? (int)$_GET['timestamp'] : null;

// PHP caches file data, like requesting the size of a file, by default. clearstatcache() clears that cache
clearstatcache();
// get timestamp of when file has been changed the last time
$last_change_in_data_file = filemtime($data_source_file);

// if no timestamp delivered via ajax or msgsrv.php has been changed SINCE last ajax timestamp
if ($last_ajax_call == null || $last_change_in_data_file > $last_ajax_call) {

    // get content of msgsrv.php
    $data = file_get_contents($data_source_file);

    // put msgsrv.php's content and timestamp of last msgsrv.php change into array
    $result = array(
        'data_from_file' => $data,
        'timestamp' => $last_change_in_data_file
    );

    $json = json_encode($result);
    echo $json;

    break;

} else {
    sleep( 1 );
    continue;
}
}
?>

include("../db.php");
    global $dbh;
    $results = mysqli_query($dbh,"SELECT * FROM comments_lite WHERE qazi_id='1012' ORDER BY date DESC LIMIT 1") or die(mysqli_error($dbh));

while($rows = mysqli_fetch_assoc($results)) {
    $id = $rows['id'];
    $qazi_id = $rows['qazi_id'];
    $detail = $rows['detail'];
    $username = $rows['username'];
    //etc. all

    echo '<div id="nm">'.$username.'</div><div id="dt">'.$detail.'</div>'