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run code in 200+ php & hhvm versions
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<?php $a = [ 23 => [ 'foo' ], 42 => 'bar', ]; var_dump( filter_var( $a, FILTER_UNSAFE_RAW, FILTER_FORCE_ARRAY ) ); var_dump( filter_var( $a[23], FILTER_UNSAFE_RAW, FILTER_FORCE_ARRAY ) ); var_dump( filter_var( $a[42], FILTER_UNSAFE_RAW, null ) );
based on 4sItX
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
array(2) { [23]=> array(1) { [0]=> string(3) "foo" } [42]=> string(3) "bar" } array(1) { [0]=> string(3) "foo" } string(3) "bar"