feat: add ArrayHelper::dotKeyExists()

Author: kenjis

system/Helpers/Array/ArrayHelper.php

@@ -11,6 +11,8 @@
 
 namespace CodeIgniter\Helpers\Array;
 
+use InvalidArgumentException;
+
 /**
  * @interal This is internal implementation for the framework.
  *
@@ -112,6 +114,59 @@ private static function arraySearchDot(array $indexes, array $array)
         return null;
     }
 
+    /**
+     * array_key_exists() with dot array syntax.
+     *
+     * If wildcard `*` is used, all items for the key after it must have the key.
+     */
+    public static function dotKeyExists(string $index, array $array): bool
+    {
+        if (str_ends_with($index, '*') || str_contains($index, '*.*')) {
+            throw new InvalidArgumentException(
+                'You must set key right after "*". Invalid index: "' . $index . '"'
+            );
+        }
+
+        $indexes = self::convertToArray($index);
+
+        // If indexes is empty, returns false.
+        if ($indexes === []) {
+            return false;
+        }
+
+        $currentArray = $array;
+
+        // Grab the current index
+        while ($currentIndex = array_shift($indexes)) {
+            if ($currentIndex === '*') {
+                $currentIndex = array_shift($indexes);
+
+                foreach ($currentArray as $item) {
+                    if (! array_key_exists($currentIndex, $item)) {
+                        return false;
+                    }
+                }
+
+                // If indexes is empty, all elements are checked.
+                if ($indexes === []) {
+                    return true;
+                }
+
+                $currentArray = self::dotSearch('*.' . $currentIndex, $currentArray);
+
+                continue;
+            }
+
+            if (! array_key_exists($currentIndex, $currentArray)) {
+                return false;
+            }
+
+            $currentArray = $currentArray[$currentIndex];
+        }
+
+        return true;
+    }
+
     /**
      * Groups all rows by their index values. Result's depth equals number of indexes
      *

tests/system/Helpers/Array/ArrayHelperDotKeyExistsTest.php

@@ -0,0 +1,72 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <[email protected]>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Helpers\Array;
+
+use CodeIgniter\Test\CIUnitTestCase;
+use InvalidArgumentException;
+
+/**
+ * @group Others
+ *
+ * @internal
+ */
+final class ArrayHelperDotKeyExistsTest extends CIUnitTestCase
+{
+    private array $array = [
+        'contacts' => [
+            'friends' => [
+                ['name' => 'Fred Flinstone', 'age' => 20],
+                ['age' => 21], // 'name' key does not exist
+            ],
+        ],
+    ];
+
+    public function testDotKeyExists(): void
+    {
+        $this->assertFalse(ArrayHelper::dotKeyExists('', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('not', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.friends', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('not.friends', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.friends.0.name', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.1.name', $this->array));
+    }
+
+    public function testDotKeyExistsWithEndingWildCard(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('You must set key right after "*". Invalid index: "contacts.*"');
+
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*', $this->array));
+    }
+
+    public function testDotKeyExistsWithDoubleWildCard(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('You must set key right after "*". Invalid index: "contacts.*.*.age"');
+
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.*.age', $this->array));
+    }
+
+    public function testDotKeyExistsWithWildCard(): void
+    {
+        $this->assertTrue(ArrayHelper::dotKeyExists('*.friends', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.friends.*.age', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.friends.*.name', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('*.friends.*.age', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('*.friends.*.name', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.0.age', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.1.age', $this->array));
+        $this->assertTrue(ArrayHelper::dotKeyExists('contacts.*.0.name', $this->array));
+        $this->assertFalse(ArrayHelper::dotKeyExists('contacts.*.1.name', $this->array));
+    }
+}