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<?php $array = [ 'foo' => '', '' => 'bar', 17 => 'baz', 'foobar' => 19, 0 => 'barfoo', 'barbaz' => 0, ]; var_dump(array_filter($array)); var_dump(array_filter($array, null)); var_dump(array_filter($array, null, ARRAY_FILTER_USE_KEY)); var_dump(array_filter($array, null, ARRAY_FILTER_USE_BOTH));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" } array(4) { [""]=> string(3) "bar" [17]=> string(3) "baz" ["foobar"]=> int(19) [0]=> string(6) "barfoo" }

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