php-parser/README.md

PHP Parser
==========

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This is a PHP 5.2 to PHP 7.2 parser written in PHP. Its purpose is to simplify static code analysis and
manipulation.

[**Documentation for version 3.x**][doc_3_x] (stable; for running on PHP >= 5.5; for parsing PHP 5.2 to PHP 7.2).

[Documentation for version 4.x][doc_master] (development; for running on PHP >= 7.0; for parsing PHP 5.2 to PHP 7.2).

In a Nutshell
-------------

The parser turns PHP source code into an abstract syntax tree. For example, if you pass the following code into the
parser:

```php
<?php
echo 'Hi', 'World';
hello\world('foo', 'bar' . 'baz');
```

You'll get a syntax tree looking roughly like this:

```php
array(
    0: Stmt_Echo(
        exprs: array(
            0: Scalar_String(
                value: Hi
            )
            1: Scalar_String(
                value: World
            )
        )
    )
    1: Expr_FuncCall(
        name: Name(
            parts: array(
                0: hello
                1: world
            )
        )
        args: array(
            0: Arg(
                value: Scalar_String(
                    value: foo
                )
                byRef: false
            )
            1: Arg(
                value: Expr_Concat(
                    left: Scalar_String(
                        value: bar
                    )
                    right: Scalar_String(
                        value: baz
                    )
                )
                byRef: false
            )
        )
    )
)
```

You can then work with this syntax tree, for example to statically analyze the code (e.g. to find
programming errors or security issues).

Additionally, you can convert a syntax tree back to PHP code. This allows you to do code preprocessing
(like automatedly porting code to older PHP versions).

Installation
------------

The preferred installation method is [composer](https://getcomposer.org):

    php composer.phar require nikic/php-parser

Documentation
-------------

 1. [Introduction](doc/0_Introduction.markdown)
 2. [Usage of basic components](doc/2_Usage_of_basic_components.markdown)
 3. [Other node tree representations](doc/3_Other_node_tree_representations.markdown)
 4. [Code generation](doc/4_Code_generation.markdown)
 5. [Frequently asked questions](doc/5_FAQ.markdown)

Component documentation:

 * [Name resolution](doc/component/Name_resolution.markdown)
 * [Pretty printing](doc/component/Pretty_printing.markdown)
 * [Lexer](doc/component/Lexer.markdown)
 * [Error handling](doc/component/Error_handling.markdown)

 [doc_3_x]: https://github.com/nikic/PHP-Parser/tree/3.x/doc
 [doc_master]: https://github.com/nikic/PHP-Parser/tree/master/doc