已发送奇怪的PHP标头

Question

I have a simple template rendering system that includes a header, template and footer PHP file. 我有一个简单的模板渲染系统，其中包括页眉，模板和页脚PHP文件。 The header has a single PHP function call to render a navigation bar. 标头具有单个PHP函数调用，以呈现导航栏。 The template has a function call that sets a header('location ...'); 该模板有一个函数调用，用于设置标头（“ location ...”）； and the footer is just basic HTML. 页脚只是基本的HTML。

When I view the page, I get a 'headers already sent' error, specifying the line in the header that makes the call to echo out the navigation bar. 当我查看页面时，出现“已发送标题”错误，在标题中指定进行呼叫以呼出导航栏的行。 If I modify the code to remove the child elements in the navigation, I don't get the 'headers already sent' error. 如果我修改代码以删除导航中的子元素，则不会收到“已发送标题”错误。 The child elements are nothing more than array items. 子元素不过是数组项。 If I replace them with dummy text, then the page redirects correctly. 如果我将其替换为伪文本，则页面将正确重定向。

I imagine it's something very simple, but it has me stumped! 我想这很简单，但是却让我感到困惑！

header.php (the int passed in specifies the depth to scan) header.php（传入的int指定要扫描的深度）

<ul class="nav navbar-nav"><?php echo getNavigation(1); ?></ul>

template.php 的template.php

// Run from start
default:
        $_SESSION['updateStart'] = microtime(true);
        $_SESSION['updateErrors'] = array();
        $_SESSION['updateLog'] = array();
        header('location: /update-products?action=getDataFeeds');
        exit();
break;

getNavigation function: getNavigation函数：

function getNavigation($depth) {
    global $path, $misc;

    $items = $misc->getNavigation(1,(int)$depth,true);
    $nav = "";

    if($items) {
        foreach($items as $item) {
            $class = ($item['ob_alias']==("/".$path[0])?' class="active"':'');
            $nav .= '<li'.$class.'>';

            if(isset($item['children'])) {
                $nav .= '<a href="#" class="dropdown-toggle" data-toggle="dropdown">'.$item['ob_label'].' <span class="caret"></span></a>';
                $nav .= '<ul class="dropdown-menu" role="menu">';
                foreach($item['children'] as $child) {
                    $class = ((isset($path[1]) && $child['ob_alias']==("/".$path[1]))?' class="active"':'');
                    $nav .= '<li'.$class.'><a href="'.$child['ob_alias'].'">'.$child['ob_label'].'</a></li>';
                }
                $nav .= '</ul>';
            } else {
                $nav .= '<a href="'.$item['ob_alias'].'">'.$item['ob_label'].'</a>';
            }
            $nav .= '</li>';
        }
    }       
    return $nav;
}

I've tried to walk through my code and all that I can seem to do to toggle the error Vs. 我试图遍历我的代码以及似乎可以做的所有事情来切换错误Vs。 having the page run as expected is to replace this line in my getNavigation() call: 使页面按预期运行将替换我的getNavigation（）调用中的这一行：

$nav .= '<li'.$class.'><a href="'.$child['ob_alias'].'">'.$child['ob_label'].'</a></li>';

with 同

$nav .= '<li>Some dummy text</li>';

Then it's fine. 那很好 I can't see why including the two array item strings would break the 'headers'. 我看不到为什么包含两个数组项字符串会破坏“标题”。

Any help, or pointers for things to test would be most welcome. 任何帮助，或需要测试的东西的指针都是最欢迎的。

Answer 1

Seeing the order you are loading all of this may help but based on what you have, I would suspect you are rendering something (like the nav) before setting the headers in template.php. 查看您正在加载的所有内容的顺序可能会有所帮助，但是基于您所拥有的内容，我怀疑您正在渲染某些内容（如导航），然后在template.php中设置标题。 You may want to reference this answer as well as post more specific code that show in what order the template files are being loaded. 您可能要参考此答案，并发布更具体的代码，这些代码以什么顺序显示模板文件的加载。

Functions that send/modify HTTP headers must be invoked before any output is made. 

Otherwise the call fails.

Output can be:

Unintentional:

   Whitespace before <?php or after ?>
   UTF-8 Byte Order Mark
   Previous error messages or notices

Intentional:

   print, echo and other functions producing output (like var_dump)
   Raw <html> areas before <?php code.

已发送奇怪的PHP标头

问题描述

1 个解决方案

解决方案1
1 2014-10-20 01:53:55

已发送奇怪的PHP标头

问题描述

1 个解决方案

解决方案1 1 2014-10-20 01:53:55

解决方案1
1 2014-10-20 01:53:55