在索引名称周围不使用单引号是否会明显/显着地减慢执行速度？

发布于 2024-12-10 04:19:46 字数 192 浏览 0 评论 0原文

如果我要说

echo $arr[some_index];

而不是说

echo $arr['some_index'];

错误通知会导致大量处理器时间/功率损失吗？我知道这不是正确的语法，但是在我正在从事的项目中已经有大量这样编写的代码。

原文

If I were to say

echo $arr[some_index];

as opposed to saying

echo $arr['some_index'];

Will there be a significant amount of processor time/power lost to the error notice? I am aware that it is not proper syntax, but there is a huge amount of code written like this already on a project I am working on.

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独闯女儿国 2024-12-17 04:19:46

嗯，检查起来很简单。您可以检查任何语句的执行时间，如下所示：

$start = microtime(true);    
//Do your code. Try an echo of one kind here.    
$end = microtime(true);    
echo($end - $start); //The elapsed time, in seconds. Precise up to a microsecond.

为您想要测试的每种类型执行其中一项。自然，无论哪个始终最快，都将是最快的。

您还可以使用 memory_get_usage 来确定每次调用之前和之后使用了多少内存。

现在，您还应该收到大量通知。如果未定义常量，则会将其视为字符串，但会引发通知。另一个问题是，如果您的密钥与常量发生冲突，您将检查错误的值。这确实不是一个好的做法。我会检查并更换所有东西。

Well, it's simple enough to check. You can check the execution time on any statement(s) like such:

$start = microtime(true);    
//Do your code. Try an echo of one kind here.    
$end = microtime(true);    
echo($end - $start); //The elapsed time, in seconds. Precise up to a microsecond.

Do one of those for each type you'd like to test. Whichever is consistently fastest will be the quickest, naturally.

You can also use memory_get_usage to determine how much memory has been used, before and after each call.

Now, you should also be getting a large number of NOTICE's. If a constant isn't defined, it's treated as a string instead, but throws a notice. Another problem is if your key ever conflicts with a constant, you'll be checking the wrong value. It's really just not good practice. I'd go through and replace everything.

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