[PHP] Some constants are missing in stubs

[mvorisek]

Description

Some core constants like DEBUG_BACKTRACE_IGNORE_ARGS are missing in the Netbeans PHP stubs.

Use case/motivation

All classes/functions/methods/properties/constants should be present to improve IDE typehinting.

some good source is https://github.com/JetBrains/phpstorm-stubs or https://3v4l.org/RUUPW

Are you willing to submit a pull request?

No

[junichi11]

I've already fixed it.
#6358