eZ Publish 5 has a strong focus on backwards compatibility and thus lets you reuse code you might have written for 4.x, including templates and modules.
This page describes built in legacy "bridge" features in 5.x. If you are looking for the same component for eZ Platform, have a look at LegacyBridge which is a optional but newer version of what is described here
Looking for 4.x documentation ?
You will find the 4.x documentation describing legacy itself in the legacy part of the documentation.
Overview of ways to run 5.x
5.x can be run in different ways as shown on Architecture page, here is the three main ways to run it, where the first two can be controlled in configuration and combined within the same installation:
|SiteAccess setting||Supported on 5.4LTS|
Supported in eZ Platform v1/v2
|Allows use of Symfony & Platform features|
- Supported on eZ Platform 1.13LTS/2.5LTS, optionally also in combination with eZ Platform Cloud with some limitations.
- Allows use of features in Platform / Symfony including Legacy migration features described on this page.
- One feature not being used in this mode is HttpCache, but all integrations to clear cache such as Http (for other siteaccessse, rest, ..) is still enabled, see below for further info.
Legacy mode, when enabled for a SiteAccess is a specific configuration mode where eZ Publish 5.x's behavior is the closest to v4.x. It might be used in some very specific use cases, such as running the admin interface, or as a temporary tool while migrating to Platform stack.
What it does
- Still runs through the whole Symfony kernel. As such, Symfony services can still be accessed from legacy stack, and all integrations like session, cache and users works as intended.
- Disables the default router, standard Symfony routes won't work in this mode, unless allowing it explicitly.
- Disables the UrlAliasRouter, letting instead legacy handle url alias lookups. As such, the Platform stack ViewController will be bypassed.
What it doesn't do
- Increase performance. Legacy mode actually degrades performances since it won't use the HttpCache mechanism, but still needs to boot up Platform/Symfony stack and setup integrations before starting eZ Publish legacy.
How to avoid this
You have different options to avoid this:
- Migrate your pagelayout to Platform stack, in order to be able to disable legacy mode and take advantage of HttpCache
- In this setup, any kind of content type which is missing override rules in Platform stack, eZ Publish will always fallback to the legacy kernel, looking for a legacy template.
- Same goes for custom legacy modules, if URL's are not handled by Symfony or by url alias, fallback goes to legacy for handling the url.
- Upgrade to PHP 7, in order to hide the performance degradation and as a bonus reduce memory by half and gain 1.5-2x performance on Symfony routes.
This avoids editors complaining about the slower backend and allows you to gradually do step 1 across several SiteAccesses. This can be done in one of two ways:
- Update to latest 5.4.x release in order to be able to use PHP 7.0 with a version of eZ Publish which has been made compatible with PHP7.
- Or: Upgrade to eZ Platform 2.5LTS, install the legacy bridge and continue to use legacy admin, with it comes eZ Publish legacy 2019.03 release which supports PHP 7.1 and higher.
In both cases you'll need to adapt your eZ Publish legacy PHP code for PHP 7 changes (7.0, 7.1, 7.2, 7.3)
- Last resort "Pure Legacy": Point web server directly at eZ Publish legacy, lose access to all Symfony/Platform/Legacy-bridge feature-set in order to postpone dealing with options above.
In this setup you use
ezpublish_legacy/folder as your
DocumentRoot, meaning the installs will have 99.9% the same behavior as 4.x with except changes done to deprecated features.
Recommended for: Large projects coming from 4.x and which first needs to bring legacy code base as a small effort up to 5.x legacy, before evaluating further steps either on 5.x or to eZ Platform with or without Legacy Bridge.
Not recommended for: Future compatibility, as this is "pure legacy" setup (see Architecture) it will not be officially supported in the future on either eZ Platform or eZ Platform Cloud.
Allowing Symfony routes to work
Symfony routes are disabled in legacy mode, which implies admin interface as well.
If for some reason you need a Symfony route to work, you add it to a whitelist :
_ezpublishLegacyTreeMenu and all REST v2 (
ezpublish_rest_ prefix) routes are allowed.
Legacy Template inclusion
It is possible to include old templates (.tpl) into new ones.
Or if you want to include a legacy template by its path, relative to
Scalar and array parameters are passed to a legacy template as-is.
Objects, however, are being converted in order to comply the legacy eZ Template API. By default a generic adapter is used, exposing all public properties and getters. You can define your own converter by implementing the appropriate interface and declare it as a service with the
Location objects from the Public API are converted into
eZContentObjectTreeNode objects (re-fetched).
Running legacy code
eZ Publish 5 still relies on the legacy kernel and runs it when needed inside an isolated PHP closure, making it sandboxed. This is available for your use as well through the
All calls from Platform/Symfony stack to legacy stack should be run inside a
runCallback() call, otherwise any writes or reads to disk can fail.
The example above is very simple and naive - in fact for accessing configuration settings from the Legacy Stack using the ConfigResolver is recommended instead.
Using the legacy closure, you'll be able to even run complex legacy features, like an eZ Find search:
Routing fallback & sub-requests
Any route that is not declared in eZ Publish 5 in an included
routing.yml and that is not a valid UrlAlias will automatically fallback to eZ Publish legacy (including admin interface).
This allows all your old modules to work as before, out-of-the-box (including kernel modules), and also allows you to reuse this code from your templates using sub requests:
Using eZ Publish 5 and Symfony features in Legacy
If for some reason you need to develop a legacy module and access to eZ Publish 5 / Symfony features (i.e. when developing an extension for admin interface), you'll be happy to know that you actually have access to all services registered in the whole framework, including bundles, through the service container.
The example below shows how to retrieve the content repository and the logger.
The example above works in legacy modules and CLI scripts
Running legacy scripts and cronjobs
Running legacy scripts and cronjobs through the Symfony stack is highly recommended !
Otherwise, features from the Symfony stack cannot be used (i.e. HTTP cache purge) and cache clearing. NB: Some script we know won't affect cache, are still documented to be executed directly.
Legacy scripts can be executed form the Symfony CLI, by using the
ezpublish:legacy:script command, specifying the path to the script as an argument.
The command will need to be executed from eZ Publish's 5 root, and the path to the desired script must exist in the
Here's a usage example:
Here we made sure to specify --env=prod, this is needed for all legacy scripts that clear cache, otherwise they will clear dev environment cache instead of prod for Symfony stack.
Options and arguments
Always pass the legacy script options and arguments AFTER script path, otherwise they will be lost.
If you want to access the script's help please be aware that you will need to use the newly introduced
--legacy-help option, since --help is already reserved for the CLI help.
--legacy-help option should be added before the path to the script for this to work.
Here's an example:
The same logic will apply for cronjob execution.
Legacy cronjobs are triggered by the
runcronjobs.php legacy script, which expects the name of the cronjob to run as a parameter.
This is how you can run cronjobs from the Symfony CLI:
Also, if you require using additional script options, please be sure to use the long name, such as
--debug to avoid conflicts between script and CLI options.
For more details regarding legacy cronjobs execution please refer to the Running cronjobs chapter existing in doc.ez.no.
Most customization work on eZ Publish legacy was done through Extensions. Due to the current dual-kernel architecture, many features written for the new stack will require some matching legacy code (a FieldType will require the equivalent datatype, a feature might require back-office customization...). In order to facilitate this, legacy bundles were implemented.
They allow you to place a legacy extension (or several) within a Symfony 2 bundle. Any such extension will be installed inside
ezpublish_legacy/extension, and automatically enabled as long as the bundle is registered.
Creating a legacy bundle extension
Legacy extensions must:
- be placed within the bundle, within an
- must be contained in their own subfolder:
- must contain an
A symlink (by default) will be created in
ezpublish_legacy/extension pointing to the
acmeextension folder. Starting from there, it will behave like any regular legacy extension.
Alternative: referencing an existing legacy extension via composer
An alternative use-case is also covered: you have an existing legacy extension, and a new stack bundle depends on it. It is possible to reference this legacy extension, without copying anything from it, and have it automatically installed and enabled when the bundle is installed and registered.
To do so, the bundle's Bundle class must implement an extra interface,
eZ\Bundle\EzPublishLegacyBundle\LegacyBundles\LegacyBundleInterface . This interface specifies a
getLegacyExtensionsNames() method, that is expected to return an array of legacy extensions names. Those legacy extension names will be enabled in legacy.
In ngsymfonytoolsbundle, we have two things:
composer.jsonrequires the legacy extension
When the bundle is installed using composer, the legacy extension gets installed inside legacy
- EzSystemsNgsymfonytoolsBundle.php implements
getLegacyExtensionsNames(), and returns
array( 'ngsymfonytools' ), automatically enabling the extension in legacy.
Running the legacy bundle install script manually
ezpublish-community/composer.json will call the legacy bundle install script after update and install. If for some reason, you want to do it manually, it looks a lot like asset install scripts:
By default, it will create an absolute symlink, but options exist to use a hard copy (
–copy) or a relative link (
The script will also avoid overwriting existing targets if they aren't links to the bundle. The
--force option will make the script erase existing targets before copying/linking.