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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Test { public $a = 1; public function &getA() {$a = [ &$this->a ]; return $a; } } class Test2 { public $as = []; public function &getAs() { $data = []; foreach ($this->as as $a) { $data[] = &$a; } return $data; } } $a = new Test(); $b = &$a->getA(); $t = new Test2(); $t->as[] = $a; $c = $t->getAs(); $a->a = 2; var_dump($b); var_dump($c);
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> &int(2) } array(1) { [0]=> object(Test)#1 (1) { ["a"]=> &int(2) } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/2iNjV on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/2iNjV on line 7
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/2iNjV on line 4
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/2iNjV on line 4
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/2iNjV on line 4
Process exited with code 255.