In xdebug_handler_dbgp.c, DBGP_FUNC(breakpoint_set) always stores the function name in the function_breakpoints hash as "class::method" (line 1133 in the 2.1.0 codebase). Which sort of makes sense here, since it's just been given -a class -m method from the client, it doesn't know whether it's a static method or an instance method.

In xdebug.c handle_breakpoints(), though, the code checks whether the function is an instance or static function and then builds the name appropriately (class->method or class::method). So if it's an instance method, the name is built as "class->method" which is never found in the function_breakpoints hash.

If I change handle_breakpoints() to always build the name as "class::method" then the breakpoint is triggered.