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<?php $keys = array('phrase', 'fruit'); $ar = ['a'=>'apple', 'b'=>'banana', 'c'=>'pear']; $new_ar = array_map(function ($v, $k) use ($keys) { return array_combine($keys, array($k, $v)); }, $ar, array_keys($ar)); print_r($new_ar);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
Array ( [0] => Array ( [phrase] => a [fruit] => apple ) [1] => Array ( [phrase] => b [fruit] => banana ) [2] => Array ( [phrase] => c [fruit] => pear ) )

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86.68 ms | 407 KiB | 5 Q