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run code in 150+ php & hhvm versions
Bugs & Features
<?php class World { static $id = 0; protected $uid; protected $worldName; const type = 'world'; public function __construct( $worldName ) { $this->setUID(); $this->worldName = $worldName; } private function setUID() { $this->uid = self::$id++; } public function whoIsPerson( Person $person ) { $personUID = $person->getUID(); if( $personUID === 0 && $this->worldName === 'Rapture' ) return $this->personIDMessage( $personUID, $this->worldName, 'Jack' ); elseif( $personUID === 0 && $this->worldName === 'Columbia' ) return $this->personIDMessage( $personUID, $this->worldName, 'Elizabeth' ); else return 'Unknown Person'; } private function personIDMessage( $id, $world, $name) { $worldUID = $this->worldUID; return "Person $id in world $world($worldUID) is $name \n"; } } class Person { static $id = 0; protected $uid; public function __construct() { $this->setUID(); } private function setUID() { $this->uid = self::$id++; } public function getUID() { return $this->uid; } } $person1 = new Person(); $world1 = new World('Rapture'); echo $world1->whoIsPerson( $person1 ); $world2 = new World('Columbia'); echo $world2->whoIsPerson( $person1 );
Output for 5.2.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined property: World::$worldUID in /in/QMM6l on line 29 Person 0 in world Rapture() is Jack Notice: Undefined property: World::$worldUID in /in/QMM6l on line 29 Person 0 in world Columbia() is Elizabeth
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.5
Notice: Undefined property: World::$worldUID in /in/QMM6l on line 29 Person 0 in world Rapture() is Jack Notice: Undefined property: World::$worldUID in /in/QMM6l on line 29 Person 0 in world Columbia() is Elizabeth
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/QMM6l on line 3
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_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/QMM6l on line 3
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/QMM6l on line 3
Process exited with code 255.