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<?php class Foo {} var_dump( array_fill_keys( array( 'a', 'b', 'c' ), new Foo() ) );
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> object(Foo)#1 (0) { } ["b"]=> object(Foo)#1 (0) { } ["c"]=> object(Foo)#1 (0) { } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function array_fill_keys() in /in/URcop on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_fill_keys() in /in/URcop on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_fill_keys() in /in/URcop on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_fill_keys() in /in/URcop on line 5