Custom PHP Class for working with arrays. Code example

class Custom_Walker {

	public $items = array();

	function __construct( $items ) {

		$this->items = $items;
	}

	function get_item( $name, $value ) {

		if ( ! $this->items ) {
			return false;
		}

		foreach ( $this->items as $item ) {

			if ( isset( $item->$name ) && $item->$name == $value ) {
				return $item;
			}
		}

		return false;
	}

	function get_item_value( $byname, $nameValue, $getName ) {

		if ( ! $this->items ) {
			return false;
		}

		if ( ! $item = $this->get_item( $byname, $nameValue ) ) {
			return false;
		}

		return isset( $item->$getName ) ? $item->$getName : false;
	}

	function get_items( $args = false ) {

		if ( ! $this->items ) {
			return false;
		}

		if ( ! $args ) {
			return $this->items;
		}

		$items = array();
		foreach ( $this->items as $item ) {

			$correct = true;
			foreach ( $args as $key => $value ) {
				if ( is_array( $value ) ) {
					if ( ! in_array( $item->$key, $value ) ) {
						$correct = false;
						break;
					}
				} else {
					if ( $item->$key != $value ) {
						$correct = false;
						break;
					}
				}
			}

			if ( $correct ) {
				$items[] = $item;
			}
		}

		return $items;
	}

	function get_field_values( $field_name ) {

		if ( ! $this->items ) {
			return false;
		}

		$fields = array();
		foreach ( $this->items as $item ) {
			if ( ! isset( $item->$field_name ) ) {
				continue;
			}
			$fields[] = $item->$field_name;
		}

		return $fields;
	}

	function get_index_values( $index_field, $value_field ) {

		if ( ! $this->items ) {
			return false;
		}

		$pack = array();
		foreach ( $this->items as $item ) {
			if ( ! isset( $item->$index_field ) || ! isset( $item->$value_field ) ) {
				continue;
			}
			$pack[ $item->$index_field ] = $item->$value_field;
		}

		return $pack;
	}

	function is_set( $name, $value ) {

		if ( ! $this->items ) {
			return false;
		}

		foreach ( $this->items as $item ) {

			if ( isset( $item->$name ) && $item->$name == $value ) {
				return true;
			}
		}

		return false;
	}

	function count( $args = false ) {
		return count( $this->get_items( $args ) );
	}

}

This code defines a PHP class Rcl_Walker with several methods.

The class is designed to work with an array of items, which can be set as a property during instantiation (__construct() method). The main purpose of this class is to provide convenient methods for working with the items in the array.

The methods provided by this class include:

get_item(): This method searches through the items in the array and returns the first item that has a specific value for a specified field ($name).
Returns false if not found.

get_item_value(): This method is similar to get_item(), but instead of returning the entire item, it returns the value of a specified field ($getName) from the item that matches the search criteria. get_items(): This method filters the items in the array based on one or more search criteria (specified as an associative array $args). Returns an array of all items that match the criteria.

get_field_values(): This method returns an array of values for a specified field ($field_name) from all items in the array.

get_index_values(): This method returns an associative array where the keys are taken from a specified field ($index_field) and the values are taken from another specified field ($value_field) from all items in the array.

is_set(): This method searches through the items in the array and returns true if at least one item has a specific value for a specified field ($name). Returns false if not found.

count(): This method returns the number of items in the array that match the search criteria (specified as an associative array $args). If no criteria are specified, returns the total number of items in the array.