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TailwindMerge 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.

Supports Tailwind v3.0 up to v3.4.

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

• Sandro Gehri: github.com/sponsors/gehrisandro

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

Table of Contents

• Get Started
• Usage
• Cache
• Configuration
• Contributing

Get Started

Requires PHP 8.1+

First, install TailwindMerge via the Composer package manager:

composer require gehrisandro/tailwind-merge-php

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

use TailwindMerge\TailwindMerge;

$tw = TailwindMerge::instance();

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

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

use TailwindMerge\TailwindMerge;

$instance = TailwindMerge::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 TailwindMerge, see the Configuration section.

Usage

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

use TailwindMerge\TailwindMerge;

$tw = TailwindMerge::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, TailwindMerge 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.

TailwindMerge::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 TailwindMerge right away. And stop reading here.

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

By default TailwindMerge 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":

TailwindMerge::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 TailwindMerge for PHP! The contribution guide can be found in the CONTRIBUTING.md file.

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