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<?php $arr = [ ['email' => 'a'], ['email' => 'b'], ['email' => 'c'] ]; var_dump(array_reduce($arr, function($str, $item) { return '' === $str ? $item['email'] : $str.', ' . $item['email']; }), '');
Output for git.master, git.master_jit, rfc.property-hooks
string(9) ", a, b, c" string(0) ""

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