Token Replacer

Credit

This package is a fork of the original, which was created by Jamie Holly of HollyIT.

Installation

composer require jesseschutt/token-replacer

Configuration

You can publish the configuration file by running the following command:

php artisan vendor:publish --provider="JesseSchutt\TokenReplacer\TokenReplacerServiceProvider"

This will create a token-replacer.php file in your config directory. Here you can set the default token start and end characters, the default token separator, and the default transformers.

Instructions

This package allows you to define tokens that can be replaced in strings. Instead of a simple str_replace, Token Replacer lets you add options to each token. Let's start with an example.

use \JesseSchutt\TokenReplacer\Facades\TokenReplacer;
use \JesseSchutt\TokenReplacer\Transformers\DateTransformer;

$input="Today is {{ date:m }}/{{ date:d }}/{{ date:y }}.";  
  
echo TokenReplacer::from($input)->with('date', DateTransformer::class)  
      
// Results in: Today is 11/11/21.      

There is a certain anatomy to tokens, so let's take a look at the {{ date:m }}. This is a default token format, but this format is configurable globally and per instance.

Transformers

The replacement of tokens is handled via a transformer. A transformer can be a closure or a simple class.

Transformers can be added to each instance of the TokenReplacer or added globally by adding them to the default_transformers array in the configuration file.

Note: Global transformers do not receive any data when instantiated. DateTransformer and AuthTransformer are the only two built-in transformers that are eligible for global use.

Per instance tokens are added via $instance->with({token name}, {class name, transformer instance or closure}); For closure based transformers the signature is:

function(string $options)

Included Transformers

All these transformers live under the \JesseSchutt\TokenReplacer\Transformers namespace.

There are also special Laravel transformers residing in \JesseSchutt\TokenReplacer\Transformers\Laravel

Post-processing

None of the transformers do any further processing except extracting the item. If you want to do further processing, such as escaping the replacements, you can define an onReplace callback:

$replacer->onReplace(function(string $result, string $token, string $options){  
  return strtoupper($result);  
});

This callback will run for every token occurrence found, so you can further filter down what tokens to operate on by checking the $token property.

Invalid or missing tokens

By default, invalid and missing tokens will remain in the string. To prevent this, you can set removeEmpty() on the TokenReplacer.