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<?php $array = [1, 1, 2, 3, 4, 5, 6, 7, 9, 9, 10]; $result = []; foreach ($array as $index => $value) { if (!isset($result[$value])) { $result[$value] = $index; } else { $result[$value] .= ",$index"; } } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => '0,1', 1 => 2, 2 => 3, 3 => 4, 4 => 5, 5 => 6, 6 => 7, 7 => '8,9', 8 => 10, )

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