WordPress Array dot notation access.

Arr.php

<?php

/**
 * Class Arr.
 */
class Arr {
	/**
	 * Get an item from an array using `dot.key.notation`.
	 *
	 * @param array  $array Target array.
	 * @param string $key The key we need to check against.
	 * @param mixed  $default The default value in case there is nothing been found.
	 *
	 * @return mixed
	 */
	public static function get( array $array, string $key, $default = null ) {
		return _wp_array_get( $array, static::dot_key_to_path( $key ), $default );
	}

	/**
	 * Get an item from an array using "dot" notation.
	 *
	 * @param array  $array Target array.
	 * @param string $key The key we need to check against.
	 * @param mixed  $value The value that will be set.
	 *
	 * @return void
	 */
	public static function set( array &$array, string $key, $value ): void {
		_wp_array_set( $array, static::dot_key_to_path( $key ), $value );
	}

	/**
	 * Prepares the dot keys into the array path.
	 *
	 * @param string $key The dot key e.g. `a.b.c.1`.
	 *
	 * @return string[]
	 */
	protected static function dot_key_to_path( string $key ): array {
		return explode( '.', $key );
	}
}