MixedEval: Allows the coder to parse a string containing a mixture of php and html.

Allows the coder to parse a string containing a mixture of php and html. The string is split into php and html sections. Each php section is evaled, while the html is displayed as is. I have also included a web based editor that makes use of the MixedEval class. The editor may be helpful for learning php. It allows the user to create a variable number of textareas, each of which can contain mixtures of php and html which, on submit, are parsed and displayed. Some error handling and feedback is also included.