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<?php class Test1 { public function __construct($z){ ++$z; echo "You sent me $z\n"; } } $c = 8; $o = new Test1($d = $c); var_dump($d,$d == $GLOBALS['d'],$z); echo "\n"; class Test2 { public function __construct(&$x){ ++$x; echo "You sent me $x\n"; } } $a = 8; $o = new Test2($b = &$a); var_dump($b,$b == $GLOBALS['b'],$x);
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
You sent me 9 Notice: Undefined variable: z in /in/EJa0v on line 10 int(8) bool(true) NULL You sent me 9 Notice: Undefined variable: x in /in/EJa0v on line 21 int(9) bool(true) NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.3
You sent me 9 Notice: Undefined variable: z in /in/EJa0v on line 10 int(8) bool(true) NULL You sent me 9 Notice: Undefined variable: x in /in/EJa0v on line 21 int(9) bool(true) NULL
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/EJa0v 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_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/EJa0v 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/EJa0v on line 3
Process exited with code 255.