[ 0 => 'ingredient-0', 1 => 'ingredient-1', 2 => 'ingredient-2', 3 => 'ingredient-3', ], 'amount' => [ 0 => 'amount-0', 1 => 'amount-1', 2 => 'amount-2', 3 => 'amount-3', ], ]; $expected = [ ['ingredient' => 'ingredient-0', 'amount' => 'amount-0'], ['ingredient' => 'ingredient-1', 'amount' => 'amount-1'], ['ingredient' => 'ingredient-2', 'amount' => 'amount-2'], ['ingredient' => 'ingredient-3', 'amount' => 'amount-3'], ]; $this->assertEqualsCanonicalizing($expected, ArrayFormat::flipTwoDimensionalKeys($input)); } }