gistfile1.txt

$ cat catchtest.php
<?php
interface FooFail {}
interface BarFail {}
class YesFail extends Exception implements FooFail, BarFail {}
class NoFail implements FooFail {}

try { throw new YesFail; }
catch (FooFail $e) { echo "Caught the foo\n"; }

try { throw new YesFail; }
catch (BarFail $e) { echo "Passed the bar\n"; }

try { throw new NoFail; }
catch (FooFail $e) { echo "Caught another foo\n"; }

$ docker run --rm -i php:5.3 php < catchtest.php
Caught the foo
Passed the bar

Fatal error: Exceptions must be valid objects derived from the Exception base class in - on line 13