diff --git a/core/lib/Drupal/Component/Utility/DiffArray.php b/core/lib/Drupal/Component/Utility/DiffArray.php
index 86b98d3..de2846e 100644
--- a/core/lib/Drupal/Component/Utility/DiffArray.php
+++ b/core/lib/Drupal/Component/Utility/DiffArray.php
@@ -13,28 +13,6 @@
 class DiffArray {
 
   /**
-   * Computes the difference between arrays.
-   *
-   * This is just a wrapper around array_diff_assoc(). The only reason Drupal
-   * provides this function is in since PHP 5.4 casting of arrays to strings
-   * throws a notice. If you want to use array_diff_assoc() as it was up to PHP
-   * 5.3, then use this function but consider the consequences -- it should be
-   * rare to use this function.
-   *
-   * @param array $array1
-   *   The array to compare from.
-   * @param array $array2
-   *   The array to compare to.
-   *
-   * @return array
-   *   Returns an array containing all the values from array1 that are not present
-   *   in array2.
-   */
-  public static function diffAssoc(array $array1, array $array2) {
-    return @array_diff_assoc($array1, $array2);
-  }
-
-  /**
    * Recursively computes the difference of arrays with additional index check.
    *
    * This is a version of array_diff_assoc() that supports multidimensional
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/DiffArrayUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/DiffArrayUnitTest.php
index dffe30a..a5ae7d2 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/DiffArrayUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/DiffArrayUnitTest.php
@@ -47,6 +47,8 @@ function setUp() {
       'null' => NULL,
       'int_diff' => 1,
       'array_diff' => array('same' => 'same', 'array' => array('same' => 'same')),
+      'array_compared_to_string' => array('value'),
+      'string_compared_to_array' => 'value',
       'new' => 'new',
     );
     $this->array2 = array(
@@ -56,22 +58,12 @@ function setUp() {
       'null' => NULL,
       'int_diff' => '1',
       'array_diff' => array('same' => 'different', 'array' => array('same' => 'same')),
+      'array_compared_to_string' => 'value',
+      'string_compared_to_array' => array('value'),
     );
   }
 
   /**
-   * Tests DiffArray::diffAssoc().
-   */
-  public function testDiffAssoc() {
-    $expected = array(
-      'different' => 'no',
-      'new' => 'new',
-    );
-
-    $this->assertIdentical(DiffArray::diffAssoc($this->array1, $this->array2), $expected);
-  }
-
-  /**
    * Tests DiffArray::diffAssocRecursive().
    */
   public function testDiffAssocRecursive() {
@@ -80,6 +72,8 @@ public function testDiffAssocRecursive() {
       'int_diff' => 1,
       // The 'array' key should not be returned, as it's the same.
       'array_diff' => array('same' => 'same'),
+      'array_compared_to_string' => array('value'),
+      'string_compared_to_array' => 'value',
       'new' => 'new',
     );