PHP-Parser/UPGRADE-4.0.md

Upgrading from PHP-Parser 3.x to 4.0

PHP version requirements

PHP-Parser now requires PHP 5.6 or newer to run. It is however still possible to parse PHP 5.2-5.5 source code, while running on a newer version.

Changes to the node structure

• Expression statements (expr;) are now represented using a Stmt\Expression node. Previously these statements were directly represented as their constituent expression.
• The name subnode of Param has been renamed to var and now contains a Variable rather than a plain string.
• The name subnode of StaticVar has been renamed to var and now contains a Variable rather than a plain string.
• The var subnode of ClosureUse now contains a Variable rather than a plain string.
• The var subnode of Catch now contains a Variable rather than a plain string.

Removed functionality

• Removed type subnode on Class, ClassMethod and Property nodes. Use flags instead.
• The ClassConst::isStatic() method has been removed. Constants cannot have a static modifier.
• The NodeTraverser no longer accepts false as a return value from a leaveNode() method. NodeTraverser::REMOVE_NODE should be returned instead.
• The XML serializer has been removed. As such, the classes Serializer\XML, and Unserializer\XML, as well as the interfaces Serializer and Unserializer no longer exist.