I have installed an extension and need to add a new function to it without editing the core extension files.

I need to add a function in this file/class: Vendor/vendor_name/module_name/block/Post/View.php

How is this done?

  • You can directly open the file and add your function, assume the need is in the template file, in the .phtml file you can use $block->myfunction(); – Krishna ijjada Feb 20 '17 at 13:57
  • Ok, yes my intention was to use the function in a template file. But I don't want to edit the extension "core" file so it could be overwritten on updates. I thought there was a way doing this within my theme? – ineluki Feb 20 '17 at 17:44

I think the best way to accomplish what you're after is to create a new module and then use the new modules's di.xml to set a preference for the file you want to add the function to, extend it, and then add your new function.

So say you've got Vendor/Module1 that you have View.php in and you want to add a function to it. Create Vendor/Module2 and then in Module2's etc/di.xml put

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="VENDOR\MODULE1\Block\Post\View"
                type="VENDOR\MODULE2\Block\Post\View" />

Then create your new Module 2 View.php and have it extend Module 1's View.php like


namespace VENDOR\MODULE2\Block\Post;

class View extends \VENDOR\MODULE1\Block\Post\View
    public function myAdditionalFunction()
        echo "Hello world";

Now you can update Module1 and not have to worry about your additional function getting overwritten in the update.

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