Added isAssociative() and isIndexed() to yii\helpers\ArrayHelper

framework/helpers/BaseArrayHelper.php

@@ -490,4 +490,71 @@ class BaseArrayHelper
 
         return $d;
     }
+
+    /**
+     * Returns a value indicating whether the given array is an associative array.
+     *
+     * An array is associative if all its keys are strings. If `$allStrings` is false,
+     * then an array will be treated as associative if at least one of its keys is a string.
+     *
+     * Note that an empty array will NOT be considered associative.
+     *
+     * @param array $array the array being checked
+     * @param boolean $allStrings whether the array keys must be all strings in order for
+     * the array to be treated as associative.
+     * @return boolean whether the array is associative
+     */
+    public static function isAssociative(array $array, $allStrings = true)
+    {
+        if (empty($array)) {
+            return false;
+        }
+
+        if ($allStrings) {
+            foreach ($array as $key => $value) {
+                if (!is_string($key)) {
+                    return false;
+                }
+            }
+            return true;
+        } else {
+            foreach ($array as $key => $value) {
+                if (is_string($key)) {
+                    return true;
+                }
+            }
+            return false;
+        }
+    }
+
+    /**
+     * Returns a value indicating whether the given array is an indexed array.
+     *
+     * An array is indexed if all its keys are integers. If `$consecutive` is true,
+     * then the array keys must be a consecutive sequence starting from 0.
+     *
+     * Note that an empty array will be considered indexed.
+     *
+     * @param array $array the array being checked
+     * @param boolean $consecutive whether the array keys must be a consecutive sequence
+     * in order for the array to be treated as indexed.
+     * @return boolean whether the array is associative
+     */
+    public static function isIndexed(array $array, $consecutive = false)
+    {
+        if (empty($array)) {
+            return true;
+        }
+
+        if ($consecutive) {
+            return array_keys($array) === range(0, count($array) - 1);
+        } else {
+            foreach ($array as $key => $value) {
+                if (!is_integer($key)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
 }