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The dude is a UNIX debugging package independent of the ptrace() system call; it consists of a kernel module [the_dude.o], a library to interface with the module [libduderino.so], and an ncurses client [ddbg] .
PHP_Dyn is PHP Extension to help debugging a PHP script.
You can get execution trace of scripts not to need change them.
HTTP request parameter can be printed.
Argument value of the function call and return value can be printed.