I want to parse a PHP source file, into an AST (preferably as a nested array of instructions).
I basically want to convert things like
f($a, $b + 1)
into something like
array( 'function_call',
array(
array( 'var', '$a' ),
array( 'expression',
array(
array( 'binary_operation',
'+',
array ('var', '$b'),
array( 'int', '1' )
)
)
)
)
)
Are there any inbuilt PHP library or third party libraries (preferably in PHP) that would let me do this?
I have implemented a PHP Parser after I figured out that there was no existing parser. It parses the PHP code into a node tree.
HipHop
You can use Facebook's HHVM to dump the AST.
apt-get install hhvm
# parse specified file and dump the AST
hhvm --parse arg
This worked for HipHop (the old PHP to C++ compiler) - back in the days of 2013!
HHVM
Update 2015
--parse is not supported.
You will get an error: HHVM The 'parse' command line option is not supported.
Feature Request to support the CLI option again: https://github.com/facebook/hhvm/issues/4615
PHP 7
PHP 7 will have an AST, see the related RFC.
There are two extensions, which provide access and expose the AST generated by PHP 7:
Pfff is an OCaml library for parsing and manipulating PHP code. See the manual of Pfff for more details.
No, there is no such feature built-in. But you can use the Tokenizer to create it.
Well, you can look at the answers from Parsing and Printing PHP Code and Generating PHP code (from Parser Tokens): basically PEAR's PHP_Beautifier package at http://pear.php.net/package/PHP_Beautifier can be extended to do what you want, but it sounds like it requires some heavy lifting.
And if you're not constrained to PHP then http://www.eclipse.org/pdt/articles/ast/PHP_AST.html walks you through using the Eclipse PHP module's AST parser.
来源：https://stackoverflow.com/questions/6153634/generate-ast-of-a-php-source-file