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<?php $array = array('red', 'white', 'blue'); $new_array = array(); $temp_array = &$new_array; foreach ($array as $item) { $temp_array = &$temp_array['and']; // $temp_array now equals null, // and it's references to parent array item with key and $temp_array['like'] = $item; } unset($temp_array); print_r($new_array);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [and] => Array ( [like] => red [and] => Array ( [like] => white [and] => Array ( [like] => blue ) ) ) )

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303.18 ms | 406 KiB | 370 Q