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TailwindClassMerge for PHP allows you to merge multiple Tailwind CSS classes and automatically resolves conflicts between classes by removing classes conflicting with a class defined later.

A PHP port of tailwind-merge by dcastil. And clone and improve from tailwind-merge-php by gehrisandro.

Supports Tailwind v3.0 up to v3.4.

If you find this package helpful, please consider sponsoring the maintainer:

• Devanox Private Limited: github.com/sponsors/devanoxltd

Attention: This package is still in early development.

If you are using Laravel, you can use the TailwindClassMerge for Laravel

Table of Contents

• Get Started
• Usage
• Cache
• Configuration
• Contributing

Get Started

Requires PHP 8.1+

First, install TailwindClassMerge via the Composer package manager:

composer require devanoxltd/tailwind-class-merge-php

Then, use the TailwindClassMerge class to merge your Tailwind CSS classes:

use TailwindClassMerge\TailwindClassMerge;

$tw = TailwindClassMerge::instance();

$tw->merge('text-red-500', 'text-blue-500'); // 'text-blue-500'

You can adjust the configuration of TailwindClassMerge by using the factory to create a new instance:

use TailwindClassMerge\TailwindClassMerge;

$instance = TailwindClassMerge::factory()
    ->withConfiguration([
        'prefix' => 'tw-',
    ])->make();

$instance->merge('tw-text-red-500', 'tw-text-blue-500'); // 'tw-text-blue-500'

For more information on how to configure TailwindClassMerge, see the Configuration section.

Usage

TailwindClassMerge is not only capable of resolving conflicts between basic Tailwind CSS classes, but also handles more complex scenarios:

use TailwindClassMerge\TailwindClassMerge;

$tw = TailwindClassMerge::instance();

// conflicting classes
$tw->merge('block inline'); // inline
$tw->merge('pl-4 px-6'); // px-6

// non-conflicting classes
$tw->merge('text-xl text-black'); // text-xl text-black

// with breakpoints
$tw->merge('h-10 lg:h-12 lg:h-20'); // h-10 lg:h-20

// dark mode
$tw->merge('text-black dark:text-white dark:text-gray-700'); // text-black dark:text-gray-700

// with hover, focus and other states
$tw->merge('hover:block hover:inline'); // hover:inline

// with the important modifier
$tw->merge('!font-medium !font-bold'); // !font-bold

// arbitrary values
$tw->merge('z-10 z-[999]'); // z-[999]

// arbitrary variants
$tw->merge('[&>*]:underline [&>*]:line-through'); // [&>*]:line-through

// non tailwind classes
$tw->merge('non-tailwind-class block inline'); // non-tailwind-class inline

It's possible to pass the classes as a string, an array or a combination of both:

$tw->merge('h-10 h-20'); // h-20
$tw->merge(['h-10', 'h-20']); // h-20
$tw->merge(['h-10', 'h-20'], 'h-30'); // h-30
$tw->merge(['h-10', 'h-20'], 'h-30', ['h-40']); // h-40

Cache

For a better performance, TailwindClassMerge can cache the results of the merge operation. To activate pass your cache instance to the withCache method.

It accepts any PSR-16 compatible cache implementation.

TailwindClassMerge::factory()
  ->withCache($cache)
  ->make();

When you are making changes to the configuration make sure to clear the cache.

Configuration

If you are using Tailwind CSS without any extra config, you can use TailwindClassMerge right away. And stop reading here.

If you're using a custom Tailwind config, you may need to configure TailwindClassMerge as well to merge classes properly.

By default TailwindClassMerge is configured in a way that you can still use it if all the following apply to your Tailwind config:

• Only using color names which don't clash with other Tailwind class names
• Only deviating by number values from number-based Tailwind classes
• Only using font-family classes which don't clash with default font-weight classes
• Sticking to default Tailwind config for everything else

If some of these points don't apply to you, you need to customize the configuration.

This is an example to add a custom font size of "very-large":

TailwindClassMerge::factory()->withConfiguration([
        'classGroups' => [
            'font-size' => [
                ['text' => ['very-large']]
            ],
        ],
    ])->make();

For a more detailed explanation of the configuration options, visit the original package documentation.

Contributing

Thank you for considering contributing to TailwindClassMerge for PHP! The contribution guide can be found in the CONTRIBUTING.md file.

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TailwindClassMerge for PHP is an open-sourced software licensed under the MIT license.