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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Foo { private $baz = 'foo'; public function peek($target, $pref){ echo "\n".'peek @'.$pref.'::$baz = '.$target->baz; } } class Bar { private $baz = 'foo'; public function peek($target, $pref){ echo "\n".'peek @'.$pref.'::$baz = '.$target->baz; } public function mess($target){ $target->baz = 'cats'; } } $foo = new Foo(); $bar = new Bar(); $bar->mess($foo); // bar messes with Foo's $baz, which should be private $foo->out('Foo'); // Foo's internal $baz remains unchanged $bar->peek($foo, 'Foo'); // however, bar continues to see its modification to Foo::$baz $foo->peek($bar, 'Bar'); // Foo tries the same thing, but it sees nothing of Bar::$baz -- which it shouldn't
based on B2025
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Cannot access private property Foo::$baz in /in/nlQIp:13 Stack trace: #0 /in/nlQIp(19): Bar->mess(Object(Foo)) #1 {main} thrown in /in/nlQIp on line 13
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Cannot access protected property in /in/nlQIp on line 13
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.6.28
Fatal error: Cannot access private property Foo::$baz in /in/nlQIp on line 13
Process exited with code 255.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/nlQIp on line 23
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/nlQIp on line 4
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 T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/nlQIp on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/nlQIp on line 4
Process exited with code 255.