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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Test implements Countable { public $prop1, $prop2,$prop3,$prop4; private $propa, $propb,$propc,$propd; protected $propx, $propy,$propz,$propzz; public function Greet() { return 'hello world'; } public function getCount() { $res = (array) $this; return count($res); } public function count() { return $this->getCount(); } } $t = new Test; echo $t->Greet(),"\n"; echo count( (array) $t),"\n"; echo $t->getCount(),"\n"; echo count($t),"\n"; echo count( array_keys(get_object_vars($t)));
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
hello world 12 12 12 4
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.5
Fatal error: Interface 'Countable' not found in /in/d2qaF on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'Countable' not found in /in/d2qaF on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/d2qaF on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/d2qaF on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/d2qaF on line 2
Process exited with code 255.