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run code in 150+ php & hhvm versions
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<?php echo Module::work('hello world.'), "\n"; echo MyModule::work('hello world.'); abstract class Module { private static $mask = '[[[%s]]]'; public static function work($it) { return preg_replace_callback('~\w+~', array('static', 'replace'), $it); } protected static function replace($matches) { return sprintf(static::$mask, $matches[0]); } } abstract class MyModule extends Module { private static $mask = '{{{%s}}}'; protected static function xreplace($matches) { return sprintf(self::$mask, $matches[0]); } }
Output for 7.0.0 - 7.1.0
[[[hello]]] [[[world]]]. Fatal error: Uncaught Error: Cannot access private property MyModule::$mask in /in/RLgsp:14 Stack trace: #0 [internal function]: Module::replace(Array) #1 /in/RLgsp(10): preg_replace_callback('~\\w+~', Array, 'hello world.') #2 /in/RLgsp(3): Module::work('hello world.') #3 {main} thrown in /in/RLgsp on line 14
Process exited with code 255.
Output for hhvm-3.12.0
[[[hello]]] [[[world]]]. Fatal error: Invalid static property access: MyModule::mask in /in/RLgsp on line 14
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.6.28
[[[hello]]] [[[world]]]. Fatal error: Cannot access private property MyModule::$mask in /in/RLgsp on line 14
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC, expecting ')' in /in/RLgsp on line 14
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC, expecting ')' in /in/RLgsp on line 14
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/RLgsp on line 5
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_CLASS in /in/RLgsp on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/RLgsp on line 5
Process exited with code 255.