在 PHP 中是否可以防止“致命错误：调用未定义的函数”？
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Is it possible in PHP to prevent "Fatal error: Call to undefined function"?
提问by supertrue
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
在 PHP 中，有什么方法可以忽略未定义的函数而不是抛出在浏览器中可见的致命错误？-即致命错误：调用未定义的函数
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?
我知道有一种将所有自定义函数包装在如下条件中的做法，但是有没有一种编程方式来获得这种效果？
if (function_exists('my_function')) {
// use my_function() here;
}
回答by AgentConundrum
No. Fatal errors are fatal. Even if you were to write your own error handler or use the @error suppression operator, E_FATALerrors will still cause the script to halt execution.
不。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错误仍会导致脚本停止执行。
The only way to handle this is to use function_exists()(and possibly is_callable()for good measure) as in your example above.
处理这个问题的唯一方法是使用function_exists()（并且可能是is_callable()为了更好的衡量），如上面的示例所示。
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.
围绕潜在的（可能的？）错误进行防御性编码总是比让错误发生并稍后处理它更好的主意。
EDIT- php7 has changed this behavior, and undefined functions/methods are catchable exceptions.
编辑- php7 改变了这种行为，未定义的函数/方法是可捕获的异常。
回答by goat
In php 7, this is now possible.
在 php 7 中，这现在是可能的。
Example codez:
示例代码：
try {
some_undefined_function_or_method();
} catch (\Error $ex) { // Error is the base class for all internal PHP error exceptions.
var_dump($ex);
}
http://php.net/manual/en/migration70.incompatible.php
http://php.net/manual/en/migration70.incompatible.php
Many fatal and recoverable fatal errors have been converted to exceptions in PHP 7. These error exceptions inherit from the Error class, which itself implements the Throwable interface (the new base interface all exceptions inherit).
许多致命和可恢复的致命错误已在 PHP 7 中转换为异常。这些错误异常继承自 Error 类，该类本身实现了 Throwable 接口（所有异常继承的新基接口）。
回答by PPrice
What you are asking for seems a little goofy, but you can get a similar effect by declaring all your functions as methods of a class and then implement __callas a method of that class to handle any undefined method calls. You can then handle calls to undefined methods however you like. Check out the documentation here.
您所要求的似乎有点愚蠢，但是您可以通过将所有函数声明为类的方法，然后将__call实现为该类的方法来处理任何未定义的方法调用来获得类似的效果。然后，您可以根据自己的喜好处理对未定义方法的调用。在此处查看文档。
回答by DevWL
If you would like to suppress this error while working with objects use this function:
如果您想在处理对象时抑制此错误，请使用此函数：
function OM($object, $method_to_run, $param){ //Object method
if(method_exists(get_class($object), $method_to_run)){
$object->$method_to_run($param);
}
}
Regards
问候
回答by Deepak Dholiyan
we can hide errors but this will log in apache error log
我们可以隐藏错误，但这会登录 apache 错误日志
//Set display error true.
//设置显示错误为真。
ini_set('display_errors', "0");
//Report all error except notice
//报告除通知外的所有错误
ini_set('error_reporting', E_ALL ^ E_NOTICE ^ E_STRICT);
//We can use try catch method
//我们可以使用try catch方法
try {
my_method();
} catch (\Error $ex) { // Error is the base class for all internal PHP error exceptions.
var_dump($ex);
}
//Check method existance
//检查方法是否存在
function_exists()
function_exists()
回答by Michele Saltori
Prevent no. But catch and log yes, using register_shutdown_function()
防止没有。但是捕获并记录是的，使用 register_shutdown_function()
See PHP manual
参见PHP 手册
function shutDown_handler()
{
$last_error = error_get_last();
//verify if shutwown is caused by an error
if (isset ($last_error['type']) && $last_error['type'] == E_ERROR)
{
/*
my activity for log or messaging
you can use info:
$last_error['type'], $last_error['message'],
$last_error['file'], $last_error['line']
see about on the manual PHP at error_get_last()
*/
}
}
register_shutdown_function ('shutDown_handler');
