在PHP中可以防止“致命错误：调用未定义的函数”？ [英] Is it possible in PHP to prevent "Fatal error: Call to undefined function"?

问题描述

在PHP中，有什么办法可以忽略未定义的函数，而不是抛出浏览器中可见的致命错误？-ie，致命错误：调用未定义的函数

我知道在以下条件中包含所有自定义函数的做法，但是有没有一个编程方式来获得这个效果？

  if（function_exists（'my_function'））{
 
 // use my_function（）here; 
 
} 
  

解决方案

致命错误是致命的。即使您要编写自己的错误处理程序或使用 @ 错误抑制运算符， E_FATAL 错误仍将导致脚本停止执行。

处理此问题的唯一方法是使用 function_exists（） （可能 is_callable（） ，如上例所示。

对于潜在的（可能的）错误，防御性编码总是更好的主意，只是让错误发生，稍后再处理。 >

编辑 - php7已更改此行为，未定义的函数/方法是可捕获的异常。

In PHP, is there any way that I can ignore functions that are undefined instead of throwing a fatal error that is visible in the browser?—i.e., Fatal error: Call to undefined function

I know that there is the practice of wrapping all custom functions in a conditional as below, but is there a programmatic way to get this effect?

if (function_exists('my_function')) { 

   // use my_function() here;

}

解决方案

No. Fatal errors are fatal. Even if you were to write your own error handler or use the @ error suppression operator, E_FATAL errors will still cause the script to halt execution.

The only way to handle this is to use function_exists() (and possibly is_callable() for good measure) as in your example above.

It's always a better idea to code defensively around a potential (probable?) error than it is to just let the error happen and deal with it later anyway.

EDIT - php7 has changed this behavior, and undefined functions/methods are catchable exceptions.

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