Casper-O / PHP-Backporter

Converts PHP 5.3 code to PHP 5.2 code

PHP Backporter

Currently supported

• const statements (converted into define function calls)
• __DIR__ magic constant (converted into dirname(__FILE__))
• Lambda functions (converted into normal functions)
• Closures (converted into classes)
• Namespaces (converted into underscore-separated pseudo namespaces)

Limitations

Closures

Closures are represented by a callable array, so calls of type $function() will be transformed into call_user_func(_array) calls. This can be a problem is functions expect arguments by reference.

Namespaces

The current namespaces implementation is very limited. Most notably it assumes all unqualified uses of constants and functions are global if a global constant with such a name is defined and local if it is not. Additionally many dynamic constructs do not work yet.

ToDo

• Dynamic scope resolution ($className::)
• Short ternary operator
• Late static binding (?)
• __callStatic magic (?)
• __invoke magic (?)
• goto (?)
• ...