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run code in 150+ php & hhvm versions
Bugs & Features
<?php class A{ public static $def = array('head'=>array('a'=>'b'),'fields'=>array('a'=>'field_a','b'=>'field_b')); } class B extends A { public function __construct() { B::$def = array_merge(parrent::$def,array('fields'=>array('c'=>'field_c'))); } } var_dump(B::$def);
based on GHPbK
Output for 5.0.0 - 5.6.21, hhvm-3.10.0, 7.0.0 - 7.1.0RC5
array(2) { ["head"]=> array(1) { ["a"]=> string(1) "b" } ["fields"]=> array(2) { ["a"]=> string(7) "field_a" ["b"]=> string(7) "field_b" } }
Output for hhvm-3.12.0

Process exited with code 137.
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/ODUlu 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/ODUlu 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/ODUlu on line 3
Process exited with code 255.