3v4l.org

run code in 500+ PHP versions simultaneously
<?php $arr = [ 0 => ['ax' => 'Aland Islands'], 1 => ['as' => 'American Samoa'], 2 => ['am' => 'Armenia'] ]; $newArr = array_merge($arr[0], $arr[1], $arr[2]); print_r($newArr); $newArr2 = array_merge(...$arr); print_r($newArr2); foreach ($arr as $item){ $key = array_keys($item)[0]; @$newArr3[$key] = $item[$key]; } print_r($newArr3);
Output for 5.6.38, 7.0.33, 7.1.25 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [ax] => Aland Islands [as] => American Samoa [am] => Armenia ) Array ( [ax] => Aland Islands [as] => American Samoa [am] => Armenia ) Array ( [ax] => Aland Islands [as] => American Samoa [am] => Armenia )
preferences:
109.65 ms | 1549 KiB | 4 Q