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<?php class X { public $mark; } $a = new X(); $a->mark = "instance1"; # in background there is a new X instance now $b = new X(); $b->mark = "instance2"; # and another $c &= $a; $a = $b; echo $a->mark . "\n"; echo $b->mark . "\n"; echo $c->mark . "\n";
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Warning: Undefined variable $c in /in/tXTCg on line 7 Fatal error: Uncaught TypeError: Unsupported operand types: null & X in /in/tXTCg:7 Stack trace: #0 {main} thrown in /in/tXTCg on line 7
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined variable: c in /in/tXTCg on line 7 Notice: Object of class X could not be converted to int in /in/tXTCg on line 7 instance2 instance2 Notice: Trying to get property 'mark' of non-object in /in/tXTCg on line 13
Output for 7.3.32 - 7.3.33, 7.4.26
instance2 instance2
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Notice: Undefined variable: c in /in/tXTCg on line 7 Notice: Object of class X could not be converted to int in /in/tXTCg on line 7 instance2 instance2 Notice: Trying to get property of non-object in /in/tXTCg on line 13
Output for 5.0.4 - 5.0.5
Notice: Undefined variable: c in /in/tXTCg on line 7 instance2 instance2 Notice: Trying to get property of non-object in /in/tXTCg on line 13
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: c in /in/tXTCg on line 7 instance2 instance2 Notice: Trying to get property of non-object in /in/tXTCg on line 13
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/tXTCg on line 3
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/tXTCg 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/tXTCg on line 3
Process exited with code 255.

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