EBNF grammar definitions for PHP?

Question

I am wondering if someone has compiled an EBNF for PHP somewhere. I found both this site and this site. Both seem like they are incomplete, though. This question is very similar, but it's a year old. I would like to know if there has been any progress made.

Answer 1

You may want to have a look at the yacc grammar PHP uses internally. I know, it's not EBNF, but maybe it's okay for your needs.

You may also want to look at the re2c lexer definition.

Answer 2

The site from which I've taken the following links is in italian but we have:

• php-syntax-yacc.txt
• php-syntax-ebnf.txt

Answer 3

ANTLR 4 PHP grammar is also available: https://github.com/antlr/grammars-v4/tree/master/php.

Features

• Heterogeneous code processing (islands):
  • HTML
  • Script
  • CSS
  • PHP
  • Heredoc
• Alternative syntax.
• Heredoc.
• Interpolation strings (but not fully covered).
• aspTags.
• Improved lexer error processing with artificial string fragments (for example double closed quote at the end: <div attr='value'' />).

Testing

Grammar has been tested (parsing without errors) on the following projects:

• phpBB-3.1.6
• ZendFramework-2.4.8

Also, this parser has been tested on plenty number of PHP files from different CMS (~70000 files).

Answer 4

An ANTLR3 grammar is available her:

  http://code.google.com/p/phpparser/

The above grammar isn't compatible with ANTLR4, the current ANTLR release.