PHP4Delphi or PHP5Delphi the new revision is basicly php inside delphi. Allows you to execute php code,set variables,read variables,set array or delete array etc.
Like Phalanger but not limited. Phalanger is not compatible with many PHP extensions they even don't even have curl extension.
Problem with PHP4DELPHI is that it dosen't work with 64 bits
ASM changes are needed. I have no experiance with
ASM.
Regarding performance.. PHP 5.3.17 can use ZEND Optimizer which compiles the code, that does the same thing that Phalanger uses plus it can use XQuery by Zorba. And I've tested it.
PHP is also much more regulary updated.