Header.php文件没有显示任何内容，也没有错误/警告

时间：2016-07-09 02:41:14

标签： php echo

我遇到问题我已经尝试解决了3个星期，并且几乎无处可去。

我的网络应用程序工作得非常好，直到有一天它完全停止工作，因为我的header.php文件被搞砸了。

基本上，问题是：

我的header.php文件显示NOTHING（查看源不显示任何内容），页面完全是白色的。我已经打开了所有错误报告，并尝试在页面顶部回显事情，但在if语句中注释掉一些变量之前，NOTHING仍然有效（见下文）

以下是我的header.php文件的前几行代码。

<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);


echo("TEST");

session_start();


if(isset($_SESSION['username'])){ //VARIABLES WITHIN THIS STATEMENT CAUSE ERROR
    $username = $_SESSION['username'];
    $email = $_SESSION['email'];
    $title = $_SESSION['title'];
    $id = $_SESSION['id'];
    $role = $_SESSION['role'];
    $fullname = $_SESSION['fullname'];
    $labname = $_SESSION['labname'];
    $date_official = $_SESSION['date'];
    $permission = $_SESSION['permission'];
    $avatar = $_SESSION['avatar'];
    $usr_ip = $_SERVER['REMOTE_ADDR'];
    $isLogged = true;

}
else
{
    $isLogged = false;
    echo("Unlogged.");
}


if($isLogged)
{
    if($permission == 7 || $permission == 1 || $permission == 2){

    echo <<<_END

<!DOCTYPE html>
<html lang="en">
<head>
...file truncated for simplicity.

如果我注释掉$ permission和$ role，那么echo＆＃34; TEST＆＃34;运行，但页面的其余部分没有。我是一个PHP菜鸟，但说实话，我已经使用PHP近5年了，从来没有遇到过这样的事情。

我非常感谢任何帮助。非常感谢你。

干杯

编辑**我被要求粘贴我的整个代码：

<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);


session_start();
echo("TEST");

if(isset($_SESSION['username'])){
    $username = $_SESSION['username'];
    $email = $_SESSION['email'];
    $title = $_SESSION['title'];
    $id = $_SESSION['id'];
    $role = $_SESSION['role'];
    $fullname = $_SESSION['fullname'];
    $labname = $_SESSION['labname'];
    $date_official = $_SESSION['date'];
    $permission = $_SESSION['permission'];
    $avatar = $_SESSION['avatar'];
    $usr_ip = $_SERVER['REMOTE_ADDR'];
    $isLogged = true;

}
else
{
    $isLogged = true;
    echo("Unlogged.");
}


if($isLogged)
{
    if($permission == 7 || $permission == 1 || $permission == 2){

        echo <<<_END

<!DOCTYPE html>
<html lang="en">
<head>
    <!--CHARSET-->
    <meta charset="UTF-8">

    <!--FAVICON-->
    <link rel='shortcut icon' type='image/x-icon' href='/favicon.ico' />

    <!--INTERNAL STYLING-->
    <link href="css/style.css" rel="stylesheet">
    <link href="css/core_styles.css" rel="stylesheet">
    <link rel="stylesheet" type="text/css" href="css/core_styles.css">
    <link rel="stylesheet" type="text/css" href="css/style.css">
    <link rel="stylesheet" href="css/calendar.css" />
    <link rel="stylesheet" type="text/css" href="css/font-awesome.css">
    <link rel="stylesheet" href="css/dropzone.css">

    <!--JQUERY AND JQUERY UI-->
    <script src="js/jquery-2.2.3.min.js"></script>
    <script src="js/jquery-ui.min.js"></script>
    <link rel="stylesheet" type="text/css" media="all" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/smoothness/jquery-ui.css"    />


    <!--INTERNAL SCRIPTS-->
    <script src="js/functions.js"></script>
    <script src="js/account.js"></script>
    <script src="js/storage.js"></script>
    <script src="js/notebook.js"></script>
    <script src="js/protocol.js"></script>
    <script src="js/calendar.js"></script>
    <script src="js/members.js"></script>
    <script src="js/administration.js"></script>
    <script src="js/dash.js"></script>

    <!--CHARTS-->
    <script src="js/Chart.min.js"></script>

    <!--DROPZONE-->
    <script src="js/dropzone.js"></script>

    <!--BOOTSTRAP-->
    <link type="text/css" href="css/bootstrap.css" rel="stylesheet">
    <script src="js/bootstrap.min.js"></script>

    <!--SUMMERNOTE-->
    <script src="http://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.1/summernote.js"></script>
    <link href="http://cdnjs.cloudflare.com/ajax/libs/summernote/0.8.1/summernote.css" rel="stylesheet">

    <!--TOOLTIPS-->
    <link rel="stylesheet" type="text/css" href="css/tooltipster.css" />
    <script type="text/javascript" src="js/jquery.tooltipster.min.js"></script>


    <title>FMAX ($labname)</title>
</head>
<body>
<div id="appWrapper">
<div id="point_prompt"></div>
    <div id="appPanelLeft">

        <!--LOGO CONTAINER-->
        <div id="appLogo" class="subPanel">
            <span class="logoF logoFont textDeny">F </span><span class="logoMax logoFont textDeny">M A X</span>
        </div>

        <!--PROFILE PICTURE CONTAINER-->
        <div id="subPanel_0" class="subPanel">
            <div class="profilePicture" style="background-image: url($avatar)"></div>
            <div class="ta_center">
                <span id="pnl_username" class="regTextPanelB">$fullname</span>
                <br/>
                <span id="pnl_permis" class="hintTextA">$role</span>
                <br/>
                <span id="pnl_degree" class="hintTextA">$title</span>
                <br/>
            </div>
        </div>

        <!--MAIN NAV CONTAINER-->
        <div id="subPanel_1" class="subPanel">
        <table id="navTable">
        <tr>
            <td>
            <div data-value="0" class="pnlNavBtn">
                <span class="fa fa-home fa-3x fa-fw myBlue"></span><br/>
                <span class="regTextPanelA">Dashboard</span>
            </div>
            </td>
            <td>
            <div data-value="1" class="pnlNavBtn">
                <span class="fa fa-book fa-3x fa-fw myPurple"></span>
                <span class="regTextPanelA">Notebook</span>
            </div></td>
        </tr>

        <tr>
            <td>
            <div data-value="2" class="pnlNavBtn">
                <span class="fa fa-shopping-cart fa-3x fa-fw myYellow"></span>
                <span class="regTextPanelA">Orders</span>
            </div>
            </td>

            <td>
            <div data-value="3" class="pnlNavBtn">
                <span class="fa fa-list fa-3x fa-fw myOrange"></span>
                <span class="regTextPanelA">Protocols</span>
            </div>
            </td>
        </tr>

        <tr>
            <td>
            <div data-value="4" class="pnlNavBtn">
                <span class="fa fa-database fa-3x fa-fw myGreen"></span>
                <span class="regTextPanelA">Storage</span>
            </div>
            </td>

            <td>
            <div data-value="5" class="pnlNavBtn">
                <span class="fa fa-users fa-3x fa-fw myDarkBlue"></span>
                <span class="regTextPanelA">Members</span>
            </div>
            </td>
        </tr>

        <tr>
            <td>
            <div data-value="6" class="pnlNavBtn">
                <span class="fa fa-calendar fa-3x fa-fw myYellow"></span>
                <span class="regTextPanelA">Calendar</span>
            </div>
            </td>
            <td>
            <div data-value="8" class="pnlNavBtn">
                    <span class="fa fa-lock fa-3x fa-fw myRose"></span>
                    <span class="regTextPanelA">Administration</span>
                </div>
            </td>
        </tr>

        </table>

        </div>

        <!--USER NAV CONTAINER-->
        <div id="subPanel_2" class="subPanel">
            <span class="hintTextA">User</span>
            <br/>
            <br/>
            <div data-value="9" class="pnlNavBtn list">
                <span class="fa fa-user fa-fw myBlue"></span>
                <span class="regTextPanelA">Account</span>
            </div>
            <a href="logout.php"><div class="pnlNavBtn list">
                <span class="fa fa-sign-out fa-fw myBlue"></span>
                <span class="regTextPanelA">Logout</span>
            </div>
            </a>

        </div>

        <!--LAB MODULES CONTAINER-->
        <div id="subPanel_3" class="subPanel">
            <span class="hintTextA">Public Lab Page</span>
            <br/>
            <br/>
            <div data-value="10" class="pnlNavBtn list">
                <span class="fa fa-edit fa-fw myBlue"></span>
                <span class="regTextPanelA">Edit Modules</span>
            </div>

        </div>



    </div>
    <div id="appWindow">

        <!--TOOLBAR -->
        <div id="appToolbar" class="row">

            <nav class="navToolbar">
                <ul>
                    <li id="app_msgs_btn"><span class="fa fa-lg fa-envelope-o myDarkBlue"></span>  <span class="notificationHint small" id="inboxHint">0</span></li>
                    <li id="app_notif_btn"><span class="fa fa-lg fa-exclamation-circle myRose"></span>  <span class="notificationHint small" id="notifHint">0</span></li>
                <ul>
            </nav>

        </div>

        <div id="notificationPane">

        <div class="notification">
            <span class="fa fa-fw fa-exclamation myRed"></span> Lorem ipsum dolor sit amet.
        </div>
                <div class="notification">
            <span class="fa fa-fw fa-exclamation myRed"></span> If you type for long enough, your text might just extend two lines.
        </div>
                <div class="notification">
            <span class="fa fa-fw fa-exclamation myRed"></span> Some Content.
        </div>
                <div class="notification">
            <span class="fa fa-fw fa-exclamation myRed"></span> Some Content.
        </div>
                <div class="notification read">
            <span class="fa fa-fw fa-exclamation myRed"></span> Some Content.
        </div>

        </div>

_END;

    }
}
else{
    echo("Error.");
}

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