火狐页面全白_为什么我PHP页面加载全白？

r囧r小猫 2022-12-06 15:47 150阅读 0赞

火狐页面全白

You upload your [PHP][] web page and go to view it. Instead of seeing what you expected, you see nothing. A blank screen (often white), no data, no error, no title, nothing. You view the source ... it's blank. What happened?

您上传了[PHP][]网页，然后进行查看。 没有看到您的期望，什么都没看到。 黑屏(通常为白色)，没有数据，没有错误，没有标题，什么也没有。 您查看源代码...空白。 发生了什么？

## 缺少密码 **(** Missing Code **)** ##

The most common reason for a blank page is that the script is missing a character. If you left out a **'** or **\}** or **;** somewhere, your [PHP won't work][PHP won_t work]. You don't get an error; you just get a blank screen.

空白页的最常见原因是脚本缺少字符。 如果省略了**'**或**\}**或**;** 在某个地方，您的[PHP无法正常工作][PHP won_t work] 。 您不会出错。 您只会得到黑屏。

There is nothing more frustrating than looking through thousands of lines of code for the one missing semicolon that is messing the whole thing up. What can be done to correct and prevent this from happening?

没有比遍历数千行代码寻找使整个事情搞砸的一个缺少的分号更令人沮丧的了。 如何纠正和防止这种情况发生？

*  **Turn on PHP Error Reporting.** You can learn a lot about what is going wrong from the error messages PHP gives you. If you aren't currently getting error messages, you should [turn on PHP error reporting][].
    
    **打开PHP错误报告。** 您可以从PHP给您的错误消息中了解很多问题。 如果当前未收到错误消息，则应[打开PHP错误报告][turn on PHP error reporting] 。
 *  **Test your code often.** If you test each piece as you add it, then when you encounter a problem, you know the specific section to troubleshoot. It'll be in whatever you just added or changed.
    
    **经常测试您的代码。** 如果在添加每个部件时进行测试，则遇到问题时，您将知道要进行故障排除的特定部分。 它会出现在您刚刚添加或更改的任何内容中。
 *  **Try a color-coded editor.** A lot of PHP editors—even free ones—color code your PHP as you enter it. This helps you pick out lines that don't end because you'll have large chunks of code in the same color. It's non-intrusive for programmers who prefer to code with no bells and whistles but helpful when troubleshooting.
    
    **尝试使用颜色编码的编辑器。** 许多PHP编辑器(甚至是免费PHP编辑器)在输入PHP时都会对其进行颜色编码。 这将帮助您挑选出不会结束的行，因为您将拥有大块相同颜色的代码。 对于喜欢无障碍编程但对故障排除有帮助的程序员而言，这是一种非侵入式的方法。
 *  **Comment it out.**  One way to isolate the problem is to [comment out][] large chunks of your code. Start at the top and comment out all but the first couple of lines in a large block. Then echo () a test message for the section. If it echoes fine, the problem is in a section further down in the code. Move the start of your comment and your test echo downward as you work through your document, until you find the problem.
    
    **注释掉。** 解决问题的一种方法是[注释掉][comment out]大部分代码。 从顶部开始，并注释掉大块中除前几行外的所有行。 然后echo()该部分的测试消息。 如果响应良好，则问题出在代码的下一部分。 在处理文档时，将注释的开头移至下方，并且测试将回显，直到找到问题为止。

## 如果您的站点使用循环 **(** If Your Site Uses Loops **)** ##

If you use [loops in your code][], it could be that your page is stuck in a loop that never stops loading. You may have forgotten to add **++** to the counter at the end of a loop, so the loop continues to run forever. You may have added it to the counter but then accidentally overwritten it at the start of the next loop, so you never gain any ground.

如果[在代码中][loops in your code]使用[循环][loops in your code] ，则可能是页面卡在了永不停止加载的循环中。 您可能忘记了在循环结束时将**++**添加到计数器，因此循环将永远继续运行。 您可能已将其添加到计数器中，但随后在下一个循环开始时不小心将其覆盖，因此您永远不会获得任何帮助。

One way to help you spot this is to echo() the current counter number or other useful information at the beginning of each cycle. This way you might get a better idea of where the loop is tripping up.

一种可以帮助您发现此问题的方法是在每个周期开始时用echo()当前计数器编号或其他有用信息。 这样，您可能会更好地了解回路跳到哪里。

## 如果您的站点不使用循环 **(** If Your Site Doesn't Use Loops **)** ##

Check that any HTML or [Java][] you use on your page isn't causing a problem and that any [included pages][] are without error.

检查您在页面上使用的任何HTML或[Java][]是否都不会引起问题，并且所有[包含的页面][included pages]都没有错误。

> 翻译自: [https://www.thoughtco.com/my-page-has-loaded-all-white-2694199][https_www.thoughtco.com_my-page-has-loaded-all-white-2694199]

火狐页面全白

[PHP]: https://www.thoughtco.com/learn-php-2693925
[PHP won_t work]: https://www.thoughtco.com/php-code-showing-instead-of-running-2694209
[turn on PHP error reporting]: https://www.thoughtco.com/php-error-reporting-2694206
[comment out]: https://www.thoughtco.com/beginners-guide-to-php-programing-2693961
[loops in your code]: https://www.thoughtco.com/an-introduction-to-loops-in-php-2693960
[Java]: https://www.thoughtco.com/what-is-java-2034117
[included pages]: https://www.thoughtco.com/including-external-files-in-php-2693792
[https_www.thoughtco.com_my-page-has-loaded-all-white-2694199]: https://www.thoughtco.com/my-page-has-loaded-all-white-2694199