xml - What is the DOM Core Level / Version Supported by PHP DOM?

Question

What is the DOM Core Version is Supported by PHP DOM? I can see there are many different ones listed like (list):

• Document Object Model (Core) Level 1 (via Document Object Model (DOM) Level 1 Specification)
• Document Object Model Core Level 2
• Document Object Model Core Level 3

Which one is supported?

Answer 1

The dom core version depends on the libxml2 version PHP is linked against. You can even replace the binary version of the library under the hood without need to recompile php. (That's hakish and limited I know, but once I did that because the debian lenny version of libxml2 had a bug)

For runtime detection of this features in PHP @hakre's answers is a nice snippet