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<?php class User { public $profile; } class Profile { public $user; public function __construct(User $user) { $this->user = $user; $user->profile = $this; } } $user1 = new User(); $profile1 = new Profile($user); $user2 = new User(); $profile2 = new Profile($user); $profile1 == $profile2;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined variable $user in /in/bkZrq on line 22 Fatal error: Uncaught TypeError: Profile::__construct(): Argument #1 ($user) must be of type User, null given, called in /in/bkZrq on line 22 and defined in /in/bkZrq:13 Stack trace: #0 /in/bkZrq(22): Profile->__construct(NULL) #1 {main} thrown in /in/bkZrq on line 13
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: user in /in/bkZrq on line 22 Fatal error: Uncaught TypeError: Argument 1 passed to Profile::__construct() must be an instance of User, null given, called in /in/bkZrq on line 22 and defined in /in/bkZrq:13 Stack trace: #0 /in/bkZrq(22): Profile->__construct(NULL) #1 {main} thrown in /in/bkZrq on line 13
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught TypeError: Argument 1 passed to Profile::__construct() must be an instance of User, null given, called in /in/bkZrq on line 22 and defined in /in/bkZrq:13 Stack trace: #0 /in/bkZrq(22): Profile->__construct(NULL) #1 {main} thrown in /in/bkZrq on line 13
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Notice: Undefined variable: user in /in/bkZrq on line 22 Catchable fatal error: Argument 1 passed to Profile::__construct() must be an instance of User, null given, called in /in/bkZrq on line 22 and defined in /in/bkZrq on line 13
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Notice: Undefined variable: user in /in/bkZrq on line 22 Fatal error: Argument 1 passed to Profile::__construct() must not be null, called in /in/bkZrq on line 22 and defined in /in/bkZrq on line 13
Process exited with code 255.
Output for 5.0.4 - 5.0.5
Notice: Undefined variable: user in /in/bkZrq on line 22 Fatal error: Argument 1 must not be null in /in/bkZrq on line 13
Process exited with code 255.
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: user in /in/bkZrq on line 22 Fatal error: Argument 1 must not be null in /in/bkZrq on line 13
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/bkZrq on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/bkZrq on line 6
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/bkZrq on line 6
Process exited with code 255.

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