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<?php function foo(&$foo, $bar) { $bar = explode(',', $bar); foreach ($bar as $baz) { if (!array_key_exists($baz, $foo)) { $foo[$baz] = $baz; } } } $foo = []; foo($foo, ''); foo($foo, 'foo,bar'); foo($foo, ''); var_dump($foo);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [""]=> string(0) "" ["foo"]=> string(3) "foo" ["bar"]=> string(3) "bar" }

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