Merger

Author: mabar

src/Merger.php

@@ -0,0 +1,38 @@
+<?php declare(strict_types = 1);
+
+namespace Contributte\Utils;
+
+class Merger
+{
+
+	/**
+	 * @param mixed $left
+	 * @param mixed $right
+	 * @return mixed
+	 */
+	public static function merge($left, $right)
+	{
+		if (is_array($left) && is_array($right)) {
+			foreach ($left as $key => $val) {
+				if (is_int($key)) {
+					$right[] = $val;
+				} else {
+					if (isset($right[$key])) {
+						$val = self::merge($val, $right[$key]);
+					}
+
+					$right[$key] = $val;
+				}
+			}
+
+			return $right;
+		}
+
+		if ($left === null && is_array($right)) {
+			return $right;
+		}
+
+		return $left;
+	}
+
+}

tests/Unit/Merger.phpt

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+<?php declare(strict_types = 1);
+
+use Contributte\Utils\Merger;
+use Tester\Assert;
+
+require_once __DIR__ . '/../bootstrap.php';
+
+test(function (): void {
+	$right = [
+		'default' => 'default',
+		'overriden' => 'not-overriden',
+		'merged' => [
+			'foo' => 'foo',
+			'bar' => 'bar',
+			'baz' => 'baz',
+		],
+	];
+
+	$left = [
+		'overriden' => 'overriden',
+		'new' => 'new',
+		'merged' => [
+			'baz' => 'foo',
+		],
+	];
+
+	$expected = [
+		'default' => 'default',
+		'overriden' => 'overriden',
+		'merged' => [
+			'foo' => 'foo',
+			'bar' => 'bar',
+			'baz' => 'foo',
+		],
+		'new' => 'new',
+	];
+
+	$merged = Merger::merge($left, $right);
+	Assert::same($expected, $merged);
+});
+
+test(function (): void {
+	$left = [
+		0 => 'zero left',
+		'one' => 'one left',
+		2 => 'two left',
+		'3' => 'three left',
+	];
+
+	$right = [
+		2 => 'two right',
+		'3' => 'three right',
+		4 => 'four right',
+	];
+
+	$expected = [
+		2 => 'two right',
+		'3' => 'three right',
+		4 => 'four right',
+		5 => 'zero left',
+		'one' => 'one left',
+		6 => 'two left',
+		7 => 'three left',
+	];
+
+	Assert::same($expected, Merger::merge($left, $right));
+});
+
+test(function (): void {
+	$left = 10;
+	$right = 20;
+	Assert::same(10, Merger::merge($left, $right));
+});
+
+test(function (): void {
+	$left = ['foo' => 'bar'];
+	$right = 10;
+	Assert::same(['foo' => 'bar'], Merger::merge($left, $right));
+});
+
+test(function (): void {
+	$left = 10;
+	$right = ['foo' => 'bar'];
+	Assert::same(10, Merger::merge($left, $right));
+
+	$left = null;
+	$right = ['foo' => 'bar'];
+	Assert::same(['foo' => 'bar'], Merger::merge($left, $right));
+});