How to add .ini file type to the plugin editor to read and edit?

Referring to /wp-admin/plugin-editor.php

The plugin editor does not include .ini files and I use that file type in a plugin to create dynamic message constants. I want to be able to edit that file via the editor.

I explored wp_doc_link_parse() but to no avail.

How can I add file types to the allowed list?

Answers:

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Method 1

This code below should work if you add it to your functions.php in your theme:

add_filter( 'editable_extensions', function ( $default_types ) {
    $default_types[] = 'ini';
    return $default_types;
} );

Assumptions:

• You’re using at least PHP 5.3
• You’re using at least WordPress 4.9

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