ing $parentKey  The parent key.
	 * @return array              The intersected array.
	 */
	public function arrayIntersectRecursive( $array1, $array2, $allowedKey = '', $parentKey = '' ) {
		if ( ! $allowedKey || $allowedKey === $parentKey ) {
			$array1 = $this->arrayIntersectRecursiveHelper( $array1, $array2 );
		}

		if ( empty( $array1 ) ) {
			return [];
		}

		foreach ( $array1 as $k => $v ) {
			if ( is_array( $v ) && isset( $array2[ $k ] ) ) {
				$array1[ $k ] = $this->arrayIntersectRecursive( $array1[ $k ], $array2[ $k ], $allowedKey, $k );
			}
		}

		if ( $this->isArrayNumeric( $array1 ) ) {
			$array1 = array_values( $array1 );
		}

		return $array1;
	}

	/**
	 * Recursively intersects the two given arrays. Supports arrays with a mix of nested arrays and primitive values.
	 * Helper function for arrayIntersectRecursive().
	 *
	 * @since 4.5.4
	 *
	 * @param  array $array1 The first array.
	 * @param  array $array2 The second array.
	 * @return array         The intersected array.
	 */
	private function arrayIntersectRecursiveHelper( $array1, $array2 ) {
		if ( null === $array2 ) {
			$array2 = [];
		}

		if ( is_array( $array1 ) ) {
			// First, check with keys are nested arrays and which are primitive values.
			$arrays     = [];
			$primitives = [];
			foreach ( $array1 as $k => $v ) {
				if ( is_array( $v ) ) {
					$arrays[ $k ] = $v;
				} else {
					$primitives[ $k ] = $v;
				}
			}

			// Then, intersect the primitive values.
			$intersectedPrimitives = array_intersect_assoc( $primitives, $array2 );

			// Finally, recursively intersect the nested arrays.
			$intersectedArrays = [];
			foreach ( $arrays as $k => $v ) {
				if ( isset( $array2[ $k ] ) ) {
					$intersectedArrays[ $k ] = $this->arrayIntersectRecursiveHelper( $v, $array2[ $k ] );
				} else {
					// If the nested array doesn't exist in the second array, we can just unset it.
					unset( $arrays[ $k ] );
				}
			}

			// Merge the intersected arrays and primitive values.
			return array_merge( $intersectedPrimitives, $intersectedArrays );
		}

		return array_intersect_assoc( $array1, $array2 );
	}

	/**
	 * Sorts the keys of an array alphabetically.
	 * The array is passed by reference, so it's not returned the same as in `ksort()`.
	 *
	 * @since 4.4.0.3
	 *
	 * @param array $array The array to sort, passed by reference.
	 */
	public function arrayRecursiveKsort( &$array ) {
		foreach ( $array as &$value ) {
			if ( is_array( $value ) ) {
				$this->arrayRecursiveKsort( $value );
			}
		}

		ksort( $array );
	}

	/**
	 * Creates a multidimensional array from a list of keys and a value.
	 *
	 * @since 4.5.3
	 *
	 * @param  array $keys  The keys to create the array from.
	 * @param  mixed $value The value to assign to the last key.
	 * @param  array $array The array when recursing.
	 * @return array        The multidimensional array.
	 */
	public function createMultidimensionalArray( $keys, $value, $array = [] ) {
		$key = array_shift( $keys );
		if ( empty( $array[ $key ] ) ) {
			$array[ $key ] = null;
		}

		if ( 0 < count( $keys ) ) {
			$array[ $key ] = $this->createMultidimensionalArray( $keys, $value, $array[ $key ] );
		} else {
			$array[ $key ] = $value;
		}

		return $array;
	}
}