如何捕获PHP类型暗示的“可捕获的致命错误”?

I am trying to implement Type Hinting of PHP5 on one of my class,

我正在尝试在我的一个类上实现PHP5的类型提示，

class ClassA {
    public function method_a (ClassB $b)
    {}
}

class ClassB {}
class ClassWrong{}

Correct usage:

正确使用方法:

$a = new ClassA;
$a->method_a(new ClassB);

producing error:

生产错误:

$a = new ClassA;
$a->method_a(new ClassWrong);

Catchable fatal error: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassWrong given...

可捕获的致命错误:参数1传递给ClassA::method_a()必须是ClassB的实例，ClassWrong的实例给定…

May I know if it is possible to catch that error(since it says "catchable")? and if yes, how?

我能知道是否有可能捕获那个错误(因为它说“可捕获”)吗?如果是的,怎么了?

Thank you.

谢谢你！

1 个解决方案

#1

101

Update: This is not a catchable fatal error anymore in php 7. Instead an "exception" is thrown. An "exception" (in scare quotes) that is not derived from Exception but Error; it's still a Throwable and can be handled with a normal try-catch block. see https://wiki.php.net/rfc/throwable-interface

更新:在php 7中，这不再是一个可捕获的致命错误。相反，抛出一个“异常”。一个“异常”(在吓人的引号中)，它不是来自异常而是错误;它仍然是一个可投掷的，可以用一个普通的try-catch块来处理。参见https://wiki.php.net/rfc/throwable-interface

E.g.

如。

<?php
class ClassA {
  public function method_a (ClassB $b) { echo 'method_a: ', get_class($b), PHP_EOL; }
}
class ClassWrong{}
class ClassB{}
class ClassC extends ClassB {}


foreach( array('ClassA', 'ClassWrong', 'ClassB', 'ClassC') as $cn ) {
    try{
      $a = new ClassA;
      $a->method_a(new $cn);
    }
    catch(Error $err) {
      echo "catched: ", $err->getMessage(), PHP_EOL;
    }
}
echo 'done.';

prints

打印

catched: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassA given, called in [...]
catched: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassWrong given, called in [...]
method_a: ClassB
method_a: ClassC
done.

Old answer for pre-php7 versions:
http://docs.php.net/errorfunc.constants says:

php7版本的老答案是:http://docs.php.net/errorfunc.constants:

E_RECOVERABLE_ERROR ( integer )
Catchable fatal error. It indicates that a probably dangerous error occured, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR.

see also: http://derickrethans.nl/erecoverableerror.html

参见:http://derickrethans.nl/erecoverableerror.html

e.g.

如。

function myErrorHandler($errno, $errstr, $errfile, $errline) {
  if ( E_RECOVERABLE_ERROR===$errno ) {
    echo "'catched' catchable fatal error\n";
    return true;
  }
  return false;
}
set_error_handler('myErrorHandler');

class ClassA {
  public function method_a (ClassB $b) {}
}

class ClassWrong{}

$a = new ClassA;
$a->method_a(new ClassWrong);
echo 'done.';

prints

打印

'catched' catchable fatal error
done.

edit: But you can "make" it an exception you can handle with a try-catch block

编辑:但是您可以“使”它成为一个异常，您可以使用try-catch块来处理它

function myErrorHandler($errno, $errstr, $errfile, $errline) {
  if ( E_RECOVERABLE_ERROR===$errno ) {
    echo "'catched' catchable fatal error\n";
    throw new ErrorException($errstr, $errno, 0, $errfile, $errline);
    // return true;
  }
  return false;
}
set_error_handler('myErrorHandler');

class ClassA {
  public function method_a (ClassB $b) {}
}

class ClassWrong{}

try{
  $a = new ClassA;
  $a->method_a(new ClassWrong);
}
catch(Exception $ex) {
  echo "catched\n";
}
echo 'done.';

see: http://docs.php.net/ErrorException

参见:http://docs.php.net/ErrorException

1 个解决方案

#1

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