diff --git a/framework/yii/helpers/BaseArrayHelper.php b/framework/yii/helpers/BaseArrayHelper.php
index da63238..ad8cb21 100644
--- a/framework/yii/helpers/BaseArrayHelper.php
+++ b/framework/yii/helpers/BaseArrayHelper.php
@@ -327,6 +327,29 @@ class BaseArrayHelper
 	}
 
 	/**
+	 * Checks if the given array contains the specified key.
+	 * This method enhances the `array_key_exists()` function by supporting case-insensitive
+	 * key comparison.
+	 * @param string $key the key to check
+	 * @param array $array the array with keys to check
+	 * @param boolean $caseSensitive whether the key comparison should be case-sensitive
+	 * @return boolean whether the array contains the specified key
+	 */
+	public static function keyExists($key, $array, $caseSensitive = true)
+	{
+		if ($caseSensitive) {
+			return array_key_exists($key, $array);
+		} else {
+			foreach (array_keys($array) as $k) {
+				if (strcasecmp($key, $k) === 0) {
+					return true;
+				}
+			}
+			return false;
+		}
+	}
+
+	/**
 	 * Sorts an array of objects or arrays (with the same structure) by one or several keys.
 	 * @param array $array the array to be sorted. The array will be modified after calling this method.
 	 * @param string|\Closure|array $key the key(s) to be sorted by. This refers to a key name of the sub-array
diff --git a/tests/unit/framework/helpers/ArrayHelperTest.php b/tests/unit/framework/helpers/ArrayHelperTest.php
index a2b5bee..f7410d5 100644
--- a/tests/unit/framework/helpers/ArrayHelperTest.php
+++ b/tests/unit/framework/helpers/ArrayHelperTest.php
@@ -303,4 +303,21 @@ class ArrayHelperTest extends TestCase
 			],
 		], $result);
 	}
+
+	public function testKeyExists()
+	{
+		$array = [
+			'a' => 1,
+			'B' => 2,
+		];
+		$this->assertTrue(ArrayHelper::keyExists('a', $array));
+		$this->assertFalse(ArrayHelper::keyExists('b', $array));
+		$this->assertTrue(ArrayHelper::keyExists('B', $array));
+		$this->assertFalse(ArrayHelper::keyExists('c', $array));
+
+		$this->assertTrue(ArrayHelper::keyExists('a', $array, false));
+		$this->assertTrue(ArrayHelper::keyExists('b', $array, false));
+		$this->assertTrue(ArrayHelper::keyExists('B', $array, false));
+		$this->assertFalse(ArrayHelper::keyExists('c', $array, false));
+	}
 }