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Bug #76020 Not fully implemented class only generates fatal without exception
Submitted: 2018-02-27 17:50 UTC Modified: 2018-02-27 19:25 UTC
From: elibyy at gmail dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 7.0.27 OS: Win/Nix
Private report: No CVE-ID: None
View Developer Edit
 [2018-02-27 17:50 UTC] elibyy at gmail dot com 
Description:
------------
In PHP 7 the error flow was changed that any code (even fully breaking) will pass in a try... catch block
but if you create a class that implements an interface partially, you will get a fatal but no exception is thrown, and therefore breaks the script

The error message is:
Fatal error: Class B contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (A::thing1)

Test script:
---------------
<?php
ini_set('error_reporting', E_ALL);
ini_set('display_errors', 1);

interface A {

	function thing();

	function thing1();

}

class B implements A {

	public function thing() {

	}
}

try{
	new B();
}catch(\Throwable $t){
	//expected to be catched
}

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 [2018-02-27 18:00 UTC] nikic@php.net
-Status: Open +Status: Not a bug -Package: PHP Language Specification +Package: Scripting Engine problem
 [2018-02-27 18:00 UTC] nikic@php.net 
The fatal error to exception conversion occurs on a best-effort basis. Not every place can easily throw an exception instead of a fatal. This is one of them. If the technical issues are resolved at some point in the future, this will be changed to throw as well.

PS: The exception would occur at the point of the class declaration, not at the point of instantiation. As such, your particular example code would not work in any case.
 [2018-02-27 18:07 UTC] elibyy at gmail dot com 
Hey,
This is understandable.
my main need is so that my exception handler will catch it and I will be able to know the cause of my 500
 [2018-02-27 19:25 UTC] nikic@php.net 
@elibyy: A common workaround for fatals not going through the error handler is to register a shutdown handler and then check if error_get_last() contains a fatal error.
 
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