Document callable types for Enumerable::implode() (#52937)

Author: devfrey

src/Illuminate/Collections/Collection.php

@@ -608,7 +608,7 @@ public function hasAny($key)
     /**
      * Concatenate values of a given key as a string.
      *
-     * @param  callable|string|null  $value
+     * @param  (callable(TValue, TKey): mixed)|string|null  $value
      * @param  string|null  $glue
      * @return string
      */

src/Illuminate/Collections/Enumerable.php

@@ -555,7 +555,7 @@ public function hasAny($key);
     /**
      * Concatenate values of a given key as a string.
      *
-     * @param  callable|string  $value
+     * @param  (callable(TValue, TKey): mixed)|string  $value
      * @param  string|null  $glue
      * @return string
      */

src/Illuminate/Collections/LazyCollection.php

@@ -622,7 +622,7 @@ public function hasAny($key)
     /**
      * Concatenate values of a given key as a string.
      *
-     * @param  callable|string  $value
+     * @param  (callable(TValue, TKey): mixed)|string  $value
      * @param  string|null  $glue
      * @return string
      */

types/Support/Collection.php

@@ -538,6 +538,13 @@ function ($collection, $count) {
 assertType('bool', $collection->has(0));
 assertType('bool', $collection->has([0, 1]));
 
+assertType('string', $collection->implode(function ($user, $index) {
+    assertType('User', $user);
+    assertType('int', $index);
+
+    return 'string';
+}));
+
 assertType('Illuminate\Support\Collection<int, User>', $collection->intersect([new User]));
 
 assertType('Illuminate\Support\Collection<int, User>', $collection->intersectByKeys([new User]));

types/Support/LazyCollection.php

@@ -416,6 +416,13 @@
 assertType('bool', $collection->has(0));
 assertType('bool', $collection->has([0, 1]));
 
+assertType('string', $collection->implode(function ($user, $index) {
+    assertType('User', $user);
+    assertType('int', $index);
+
+    return 'string';
+}));
+
 assertType('Illuminate\Support\LazyCollection<int, User>', $collection->intersect([new User]));
 
 assertType('Illuminate\Support\LazyCollection<int, User>', $collection->intersectByKeys([new User]));