PHP parsing technique

Can any one give me some idea about how d开发者_C百科oes a php file get parsed? I'm actually looking for the finite state machine structure for the parser. If anyone has any idea please share.

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PHP uses bison/yacc to generate a parser. Have a look at the grammar here: http://svn.php.net/viewvc/php/php-src/trunk/Zend/zend_language_parser.y?view=markup

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You better use an existing one:

Any decent PHP parser written in PHP?