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<?php /* Challenge 2: Implement AnswerInterface and get Question to echo "4". */ class Question { public function __construct(AnswerInterface $answer) { echo "What is 2 + 2?\n"; $answer = $answer->get()->the()->answer(); if ($answer instanceof AnswerInterface) { echo $answer . PHP_EOL; } } } interface AnswerInterface { public function get(); public function the(); public function answer(); } // start editing here class Answer implements AnswerInterface { function get(){ return $this->the(); } function the(){ return $the->answer(); } function answer(){ return 4; } } // end editing here $answer = new Answer; $question = new Question($answer);
Output for 7.0.5 - 7.1.0
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Answer has a deprecated constructor in /in/ogGdf on line 28 What is 2 + 2? Notice: Undefined variable: the in /in/ogGdf on line 34 Fatal error: Uncaught Error: Call to a member function answer() on null in /in/ogGdf:34 Stack trace: #0 /in/ogGdf(31): Answer->the() #1 /in/ogGdf(11): Answer->get() #2 /in/ogGdf(45): Question->__construct(Object(Answer)) #3 {main} thrown in /in/ogGdf on line 34
Process exited with code 255.
Output for 7.0.0 - 7.0.4
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Answer has a deprecated constructor in /in/ogGdf on line 28 What is 2 + 2? Notice: Undefined variable: the in /in/ogGdf on line 34 Fatal error: Uncaught Error: Call to a member function answer() on unknown in /in/ogGdf:34 Stack trace: #0 /in/ogGdf(31): Answer->the() #1 /in/ogGdf(11): Answer->get() #2 /in/ogGdf(45): Question->__construct(Object(Answer)) #3 {main} thrown in /in/ogGdf on line 34
Process exited with code 255.
Output for hhvm-3.12.0
What is 2 + 2? Notice: Undefined variable: the in /in/ogGdf on line 34 Fatal error: Uncaught exception 'BadMethodCallException' with message 'Call to a member function answer() on a non-object (null)' in /in/ogGdf:34 Stack trace: #0 /in/ogGdf(31): Answer->the() #1 /in/ogGdf(11): Answer->get() #2 /in/ogGdf(45): Question->__construct() #3 {main}
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.6.7 - 5.6.28
What is 2 + 2? Notice: Undefined variable: the in /in/ogGdf on line 34 Fatal error: Call to a member function answer() on null in /in/ogGdf on line 34
Process exited with code 255.
Output for 5.0.4 - 5.5.35
What is 2 + 2? Notice: Undefined variable: the in /in/ogGdf on line 34 Fatal error: Call to a member function answer() on a non-object in /in/ogGdf on line 34
Process exited with code 255.
Output for 5.0.0 - 5.0.3
What is 2 + 2? Notice: Undefined variable: the in /in/ogGdf on line 34 Fatal error: Call to a member function answer() on a non-object in /in/ogGdf on line 34
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/ogGdf on line 8
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/ogGdf on line 8
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/ogGdf on line 8
Process exited with code 255.