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<?php $foo = array(); $bar = array('bar'); $foo += array('foo'); $foo += array('bar','baz'); $bar += array('foo'); var_dump($foo,$bar);
Output for 4.3.0 - 7.1.0
array(2) { [0]=> string(3) "foo" [1]=> string(3) "baz" } array(1) { [0]=> string(3) "bar" }