当php/mysql if语句为true时播放声音片段？

Question

嗨,我有一个消息提示框,当用户收到新消息时出现,我想要做的是当它弹出时添加声音到这个框,我使用PHP if语句检查用户何时获得新消息和我尝试通过以下操作添加声音,但它不起作用请有人告诉我如何做到这一点.谢谢.

<?php
$check_new_chats = check_new_chats();
while ($chat = mysql_fetch_array($check_new_chats)) 
if (isset($_SESSION['user_id'])) { 
        if ($chat['to_user_id'] == $_SESSION['user_id']){ 
        echo( "<embed name='sound_file' src='/assets/music/sound_file.mp3' loop='true' hidden='true' autostart='true'/>"); ?>

Answer 1

<?php
$check_new_chats = check_new_chats();
while ($chat = mysql_fetch_array($check_new_chats)) 
if (isset($_SESSION['user_id'])) { 
    if($chat['to_user_id'] == $_SESSION['user_id']){ 
        echo '<script type="text/javascript">play_sound();</script>';
    }
}
?>

这是 JavaScript 函数：

<script type="text/javascript">
    function play_sound() {
        var audioElement = document.createElement('audio');
        audioElement.setAttribute('src', '/assets/music/sound_file.mp3');
        audioElement.setAttribute('autoplay', 'autoplay');
        audioElement.load();
        audioElement.play();
    }
</script>