(PECL apd >= 0.2) Starts the remote session debugging
(PECL apd 0.2-0.4) Throw a warning and a callstack
(PECL apd 0.2-0.4) Return all persistent resources as an array
(PECL apd 0.2) Get an array of the current variables names in the local scope
(PECL apd >= 0.2) Stops the interpreter and waits on a CR from the socket
(PECL apd 0.2-0.4) Starts the session debugging
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