diff --git a/src/collections_methods.c b/src/collections_methods.c
index 00c7aff..192b3f8 100644
--- a/src/collections_methods.c
+++ b/src/collections_methods.c
@@ -1251,7 +1251,22 @@ PHP_METHOD(Collection, plusValuesAssign)
 
 PHP_METHOD(Collection, putAll)
 {
-    
+    zval* elements;
+    ZEND_PARSE_PARAMETERS_START(1, 1)
+        Z_PARAM_ZVAL(elements)
+    ZEND_PARSE_PARAMETERS_END();
+    ELEMENTS_VALIDATE(elements, ERR_BAD_ARGUMENT_TYPE, return);
+    zend_array* current = COLLECTION_FETCH_CURRENT();
+    SEPARATE_CURRENT_COLLECTION(current);
+    ZEND_HASH_FOREACH_BUCKET(elements_arr, Bucket* bucket)
+        Z_TRY_ADDREF(bucket->val);
+        if (bucket->key)
+            zend_hash_update(current, bucket->key, &bucket->val);
+        else if (HT_IS_PACKED(elements_arr))
+            zend_hash_next_index_insert(current, &bucket->val);
+        else
+            zend_hash_index_update(current, bucket->h, &bucket->val);
+    ZEND_HASH_FOREACH_END();
 }
 
 PHP_METHOD(Collection, reduce)
diff --git a/tests/038-put-all.phpt b/tests/038-put-all.phpt
new file mode 100644
index 0000000..554d89f
--- /dev/null
+++ b/tests/038-put-all.phpt
@@ -0,0 +1,12 @@
+--TEST--
+Test Collection::putAll().
+--FILE--
+<?php
+$array = ['a' => 'foo', 'b' => 'bar'];
+$array1 = ['a' => 'b', 'c' => 'd', 'e' => 'f'];
+$collection = Collection::init($array);
+$collection->putAll($array1);
+if ($collection->toArray() != array_merge($array, $array1))
+    echo 'Collection::putAll() failed.', PHP_EOL;
+?>
+--EXPECT--