PHP 中是否有一个配置选项可以防止未定义的常量被解释为字符串？

发布于 2024-08-31 18:39:14 字数 624 浏览 4 评论 0原文

这是来自 php 手册： http://us.php.net /manual/en/language.constants.syntax.php

如果您使用未定义的常量，PHP 会假定您指的是常量本身的名称，就像您将其作为字符串调用一样（CONSTANT 与“CONSTANT”）。发生这种情况时，将发出 E_NOTICE 级别的错误。

我真的不喜欢这种行为。如果我未能定义所需的常量，我宁愿脚本失败，以便我被迫定义它。如果 PHP 尝试使用未定义的常量，有什么方法可以强制 PHP 使脚本崩溃吗？

例如。这两个脚本都做同样的事情。

<?php
define('DEBUG',1);
if (DEBUG) echo('Yo!');
?>

我

<?php
if(DEBUG) echo('Yo!');
?>

宁愿第二个脚本 DIE 并声明它尝试使用未定义的常量 DEBUG。

原文

This is from the php manual: http://us.php.net/manual/en/language.constants.syntax.php

If you use an undefined constant, PHP assumes that you mean the name of the constant itself, just as if you called it as a string (CONSTANT vs "CONSTANT"). An error of level E_NOTICE will be issued when this happens.

I really don't like this behavior. If I have failed to define a required constant, I would rather the script fail so that I am forced define it. Is there any way to force PHP to crash the script if it tries to use an undefined constant?

For example. Both of these scripts do the same thing.

<?php
define('DEBUG',1);
if (DEBUG) echo('Yo!');
?>

and

<?php
if(DEBUG) echo('Yo!');
?>

I would rather the second script DIE and declare that it tried to use an undefined constant DEBUG.

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懷念過去 2024-09-07 18:39:14

你可以做这样的事情（丑陋）：

伪代码：

/**
 * A Notice becomes an Error :)
 */
function myErrorHandler($errno, $errstr, $errfile, $errline) {
    if ($errno == E_NOTICE) { // = 8 
        if (substr($errstr ... )) { // contains something which looks like a constant notice...   
             trigger_error('A constant was not defined!', E_USER_ERROR);
        }
    }
}
set_error_handler("myErrorHandler");

查看set_error_handler()
另请检查这个很棒的评论：
http://us.php.net/manual/en/class。错误异常.php#95415

You could do something (ugly) like this:

pseudo code:

/**
 * A Notice becomes an Error :)
 */
function myErrorHandler($errno, $errstr, $errfile, $errline) {
    if ($errno == E_NOTICE) { // = 8 
        if (substr($errstr ... )) { // contains something which looks like a constant notice...   
             trigger_error('A constant was not defined!', E_USER_ERROR);
        }
    }
}
set_error_handler("myErrorHandler");

Check out set_error_handler()
Check also this great comment:
http://us.php.net/manual/en/class.errorexception.php#95415

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人生戏 2024-09-07 18:39:14

if(!defined('DEBUG')) die('failed.');

if(!defined('DEBUG')) die('failed.');

回复收藏 0 原文

嗳卜坏 2024-09-07 18:39:14

我认为没有办法更改抛出的错误类型，但您可以使用 error_reporting 以便您在开发时看到这些错误：

error_reporting(E_ALL);

I don't think there's a way to change the type of error thrown, but you can change the error reporting to E_ALL using error_reporting so that you see these errors while developing: