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FunctionParser

The PHP Function Parser library by Jeremy Lindblom.

Purpose

The PHP FunctionParser provides the ability to parse and retrieve the code defining an existing function as a string. This can be used in clever ways to generate documentation or example code or even to serialize a closure.

The class also allows you to get information about the function like the parameter names and the names and values of variables in the use statement of a closure.

General Use

The FunctionParser relies on the Reflection API and also on the PHP tokenizer (token_get_all()), so PHP must be compiled with the --enable-tokenizer flag in order for the tokenizer to be available.

Here is a small example of how it works:

use FunctionParser\FunctionParser;

$foo = 2;
$closure = function($bar) use($foo) {
    return $foo + $bar;
};

$parser = new FunctionParser(new \ReflectionFunction($closure));
$code   = $parser->getCode();

You can also use the fromCallable factory method as a convenient way to generate the reflected function automatically from any PHP callable:

$parser = FunctionParser::fromCallable(function($foo) {echo $foo . 'bar';});
$parser = FunctionParser::fromCallable('Foo::bar');
$parser = FunctionParser::fromCallable(array('Foo', 'bar'));

Installation

Requirements:

PHP 5.3.2+
PHPUnit for tests
Composer for consuming FunctionParser as a dependency

To install FunctionParser as a dependency of your project using Composer, please add the following to your composer.json config file.

{
    "require": {
        "jeremeamia/FunctionParser": "*"
    }
}

Then run php composer.phar install --install-suggests from your project's root directory to install the FunctionParser.

Building

There is a buid.xml file that you can use to generate test coverage reports, documenation, and code analytics. The current file is designed to be used with ant, but I will be migrating this to phing sometime soon. More on this later.