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<?php var_dump( explode( ' ', 'foo bar baz' ) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(4) { [0]=> string(3) "foo" [1]=> string(0) "" [2]=> string(3) "bar" [3]=> string(3) "baz" }