How to override a Zend class?

Question

I want to override a Zend class (Zend_Date). In Magento 1, I used to put Date.php in app/code/community/Zend and Magento itself used to do the rest. But now, there is no such directory. How can I override that class?

---

Edit: I installed Magento_SampleNewPage module and it shows Hello world! message properly when I go to http://domain.com/newpage. I edited composer.json and added my Date.php to it:

{
  "name": "magento/sample-module-newpage",
  "description": "A Magento 2 module that creates a new page",
  "type": "magento2-module",
  "version": "1.0.0",
  "license": [
    "OSL-3.0",
    "AFL-3.0"
  ],
  "require": {
    "php": "~5.5.0|~5.6.0|~7.0.0",
    "magento/framework": "~100.0"
  },
  "autoload": {
    "files": [ "Zend/Date.php" , "registration.php"  ],
    "psr-4": {
      "Magento\\SampleNewPage\\": ""
    }
  }
}

But still, it doesn't work. When I instantiate a new Zend_Date , it's from vendor/Magento/zendframework1/library/Zend/Date.php not my Zend_Date.

Answer 1

There is no "local code pool override" mechanism anymore. Instead you can use preferences in di.xml for any class that is instantiated by the Magento object manager, i.e. used via Dependency Injection in Magento classes. This is the equivalent to a class rewrite in Magento 1.

But for classes like Zend_Date where this is not the case, this is not possible.

However you could create a composer package that loads your own Zend_Date class before the real one is loaded via autoloading:

composer.json

{
    "name": "your/custom-date",
    "autoload": {
      "files": ["src/lib/Zend/Date.php"]
    }
}

src/lib/Zend/Date.php

class Zend_Date
{
    ...
}

Edit: After you edited a composer.json file, run composer dump-autoload to update the autoloader.

Answer 2

From my experience, we shouldn't try to override a Zend class on this way. We should create a new class, this class will extends from Zend_Date. And then, try to override some Zend Date methods in your class as you want.

Answer 3

Seems to me like an easier solution is this

Modify Magento 2 composer.json

"autoload": {
    [...]
    ,
    "files": [
        [...],
        "lib/Zend/Http/Response.php"
    ]
},

Copy the vendor/magento/zendframework1/library/Zend/Http/Response.php to lib/Zend/Http/Response.php

Then run composer dump-autoload

Warning: You are overriding entire class. But this might suit your need.