This affects both Drupal 7 & 8.
Since MENU_MAX_PARTS is set to 9 no router path can be over 9 parts long. This is not documented in the api for hook_menu in system.api.php. So if you are implementing hook_menu there is not an obvious way to tell this.

I think this should be documented in api.php file.

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#2 system-document_menu_parts_limit-1983832-1.patch820 bytestedbow
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tedbow’s picture

tedbow
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CreditAttribution: tedbow commented
Title: Document the limit of 9 parts from paths system.api.php » Document the limit of 9 parts for paths in system.api.php

just fixing title

tedbow’s picture

tedbow
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CreditAttribution: tedbow commented
Status: Active » Needs review
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system-document_menu_parts_limit-1983832-1.patch820 bytes

Here is patch to start with.

YesCT’s picture

YesCT CreditAttribution: YesCT commented 
+++ b/core/modules/system/system.api.phpundefined
@@ -738,7 +738,8 @@ function hook_menu_get_item_alter(&$router_item, $path, $original_map) {
  *   An array of menu items. Each menu item has a key corresponding to the
- *   Drupal path being registered. The corresponding array value is an
+ *   Drupal path being registered. The key can have no more than 9 parts which
+ *   are divided by slashes, "/". The corresponding array value is an
  *   associative array that may contain the following key-value pairs:

what is an example path and key that works and does not work.

I'm a little confused if it's 9 or 10 that is not allowed.

a/b/c/d/e/f/g/h/i/j/k
is allowed?
it has 11 parts and 10 slashes

Pancho’s picture

Pancho
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CreditAttribution: Pancho commented
Title: Document the limit of 9 parts for paths in system.api.php » Document the limit of 9 parts for paths

Note that missing documentation lead to #2035877: URL with more than 10 slashes is not working in new routing system.
I added a small note in the New routing system change record and the WSCCI conversion guide.

Also, see: #2036677: MENU_MAX_PARTS defined three times

jhedstrom’s picture

jhedstrom
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Location Portland, OR
CreditAttribution: jhedstrom commented
Issue summary: View changes
Status: Needs review » Needs work

This hook was removed in #2177031: Remove menu_get_item() and every use of it. . I'm not sure where the new place to document this is.

Version: 8.0.x-dev » 8.1.x-dev

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smustgrave’s picture

smustgrave CreditAttribution: smustgrave at Mobomo commented
Status: Needs work » Closed (outdated)

Moving to outdated since the variable this ticket is referencing, MENU_MAX_PARTS, no longer exists in Drupal 9

If you feel this is still an issue please reopen.

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klonos
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CreditAttribution: klonos at Salsa Digital commented
Version: 9.4.x-dev » 7.x-dev

This still hasn't been documented, and MENU_MAX_PARTS is still a thing for D7 (which is still supported). So please keep it open. Thanks.

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klonos
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CreditAttribution: klonos at Salsa Digital commented
Status: Closed (outdated) » Active