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<?php $array1 = [ 'one' => 1, 'two' => 2 ]; $array2 = [ 'one' => 1, 'two' => 2, 'three' => 3, 'four' => [ 'hello' => 1, 'hello2' => 2 ] ]; var_dump( array_diff_assoc( $array1, $array2 ) );

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