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<?php $test = [ 'Hello 123', 'walala7', 'HoHo HoHo', 'FOO bar' ]; var_dump(array_map(function($item) { return str_replace(' ', '_', strtolower($item)); } , $test));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(9) "hello_123" [1]=> string(7) "walala7" [2]=> string(9) "hoho_hoho" [3]=> string(7) "foo_bar" }

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