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<?php $array = [1, 2, 3, 4, 5, 6, 7, 8, 9]; foreach ($array as $i => $v) { $group = (int) ($i / 4); if (isset($result[$group])) { $result[$group] .= ", $v"; } else { $result[$group] = "$v"; } } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '1, 2, 3, 4', 1 => '5, 6, 7, 8', 2 => '9', )

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