php中的while循环出错了

Question

任何人都可以帮我看看吗？我想取一个数字，但我得到了这个错误

  

解析错误：第12行的E：\ Software \ Xampp \ htdocs \ pme \ main \ user_online.php中的语法错误，意外';'，期待']'

这是我的代码

<?php 

    include '../config.php';

    $sql= mysqli_query($connection,' select * from session');
    $row = mysqli_num_rows($sql);

    while($extract = mysqli_fetch_array($sql)){
        echo
        "<div class='left-total-user-online' id='left-total-user-online'>

            total user online : " .$extract[$row = mysqli_num_rows($sql);]. "</div>";

    }

?>

Answer 1

你的生活比必要的复杂得多。所有你需要编码的是

<?php 

    include '../config.php';

    $sql= mysqli_query($connection,' select * from session');
    $row = mysqli_num_rows($sql);

    echo "<div class='left-total-user-online' id='left-total-user-online'>
            total user online : $row</div>";
    }
?>