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copied!<p>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 <a href="http://docs.php.net/class.exception" rel="noreferrer">Exception</a> but <a href="http://docs.php.net/class.error" rel="noreferrer">Error</a>; it's still a <a href="http://docs.php.net/class.throwable" rel="noreferrer">Throwable</a> and can be handled with a normal try-catch block. see <a href="https://wiki.php.net/rfc/throwable-interface" rel="noreferrer">https://wiki.php.net/rfc/throwable-interface</a></p> <p>E.g.</p> <pre><code><?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: ", $err->getMessage(), PHP_EOL; } } echo 'done.'; </code></pre> <p>prints</p> <pre><code>catched: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassA given, called in [...] catched: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassWrong given, called in [...] method_a: ClassB method_a: ClassC done. </code></pre> <hr> <p>Old answer for pre-php7 versions:<br> <a href="http://docs.php.net/errorfunc.constants" rel="noreferrer">http://docs.php.net/errorfunc.constants</a> says:</p> <blockquote>E_RECOVERABLE_ERROR ( integer )<br /> Catchable fatal error. It indicates that a probably dangerous error occured, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also <a href="http://docs.php.net/manual/en/function.set-error-handler.php" rel="noreferrer">set_error_handler()</a>), the application aborts as it was an E_ERROR. </blockquote> <p>see also: <a href="http://derickrethans.nl/erecoverableerror.html" rel="noreferrer">http://derickrethans.nl/erecoverableerror.html</a></p> <p>e.g.</p> <pre><code>function myErrorHandler($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; $a->method_a(new ClassWrong); echo 'done.'; </code></pre> <p>prints</p> <pre><code>'catched' catchable fatal error done. </code></pre> <p>edit: But you can "make" it an exception you can handle with a try-catch block</p> <pre><code>function myErrorHandler($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.'; </code></pre> <p>see: <a href="http://docs.php.net/ErrorException" rel="noreferrer">http://docs.php.net/ErrorException</a></p>

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