Quercus was (is?) an attempt at doing PHP on the JVM, it's been many many years since I last looked into it. http://quercus.caucho.com/
"project zero" was an effort from ibm to run php on jvm, but it's been several years since anything was done (have to assume it's abandoned).
i remember in 2003 wondering if something to allow php to run on jvm would be useful/viable - couldn't convince too many folks in the local user group that the idea had any merit.
Re:WordPress on .NET
by jakubmisek on Tuesday February 28, 2017 @09:18AM
(#13753879)
j-php - but they don't try to be able to run existing apps
By the way, does anyone know of a similar project where the JVM is targeted instead?