PHP : Replace the contents of two or more arrays together into the first array with default properties.

replace_arrays_with_default_properties.php

<?php
	/**
	 * Replace the contents of two or more arrays together into the first array with default properties.
	 *
	 * @param array    $default     The array to replace. It will receive the new properties.
	 * @param array    $arrayN      An array containing additional properties to merge in.
	 * @return array
	 */
	function array_replace_default() {
		$arguments = func_get_args();

		if ( count( $arguments ) < 2 )
			throw new Exception( sprintf( '"%s" must contain at least 2 arguments.', __FUNCTION__ ) );

		$default = isset( $arguments[0] ) ? $arguments[0] : array();
		$arrays = array_slice( $arguments, 1 );

		foreach ( $arrays as $array ) {
			$default = array_replace( $default, array_intersect_key( $array, $default ) );
		}

		return $default;
	}

	/**
	 * Replace the contents of two or more arrays together into the first array recursively with default properties.
	 *
	 * @param array    $default     The array to replace. It will receive the new properties.
	 * @param array    $arrayN      An array containing additional properties to merge in.
	 * @return array
	 */
	function array_replace_default_deep() {
		$arguments = func_get_args();

		if ( count( $arguments ) < 2 )
			throw new Exception( sprintf( '"%s" must contain at least 2 arguments.', __FUNCTION__ ) );

		$default = isset( $arguments[0] ) ? $arguments[0] : array();
		$arrays = array_slice( $arguments, 1 );

		foreach ( $arrays as $array ) {
			$default = array_replace_recursive( $default, array_intersect_key( $array, $default ) );
		}

		return $default;
	}

	// Example
	$default = array(
		"a" => "green",
		"b" => array(
			"id" => 1
		)
	);
	$array1 = array(
		"a" => "green",
		"b" => array(
			"ids" => 1
		),
		"yellow",
		"red"
	);
	$array2 = array(
		"a" => "blue",
		"b" => array(),
		"navy",
		"red"
	);
	$result_normal = array_replace_default( $default, $array1, $array2 );
	$result_deep = array_replace_default_deep( $default, $array1, $array2 );

	echo "<pre>";
	echo "Normal Arrays Extend:\n";
	print_r($result_normal);
	echo "\nDeep Arrays Extend:\n";
	print_r($result_deep);
	echo "</pre>";
?>