[KyOSS Discuss] Help with PHP - using values in indexed array to traverse multi-dimensional array

darren-pluck.php

<?php


/**
 * pluck out a value from a nested array, based on a $path
 * where $path is a single-dim list of keys.
 *
 * @param array $form (multi-dim)
 * @param array $path (single dim)
 * @reutrn mixed $value from $form, in $path
 */
function darren($form, $path) {
	if (!is_array($form)) {
		throw new OutOfBoundsException("First arg should be an array, within which to look");
	}
	if (!is_array($path)) {
		throw new OutOfBoundsException("Second arg should be an array, of the path for");
	}
	$ref = &$form;
	foreach ($path as $key) {
		if (!in_array($key, $ref)) {
			throw new OutOfBoundsException("Unable to find {$key}");
		}
		$ref = &$ref[$key];
	}
	return $ref;
}

// example values to test

$form = [
	'a1' => [
		'b1' => [
			'c1' => [
				'd1' => 'value'
			]
		]
	]
];
$path = ['a1', 'b1', 'c1', 'd1'];

$expect = 'value';

echo (darren($form, $path) == $expect ? 'Good' : 'I Hate Life');