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<?php function __($v) { return "__($v)"; } $array1 = ['dogs' => __('Dogs'), 'cats' => __('Cats')]; $array2 = [ 'ducks' => ['width' => 350, 'height' => 350, 'crop' => true], 'cows' => ['width' => 750, 'height' => 150, 'crop' => true], ]; array_push($array1, ...array_keys($array2)); print_r($array1);
Output for git.master, git.master_jit
Array ( [dogs] => __(Dogs) [cats] => __(Cats) [0] => ducks [1] => cows )

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