As far as I can discern these are leftovers of the interactive
shell implementation that was used before PHP 5.4. Now the readline
ext makes use of normal eval calls for this.
So, dropping these until there is evidence to the contrary, as they
currently wouldn't work anyway.
In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode that pushes "call frame" on top of VM stack.
"Call frame" is actually the same zend_execute_data structure.
All the following ZEND_SEND instructions push arguments on top of the stack in a way that they directly comes into corresponding CV variables of the called frame. Extra arguments are copied at the end of stack frame (after all CV and TMP variables) on function enterance.
There are two minor incompatibilities:
1) It's not allowed to decalre functions redefining arguments e.g. "function foo($a,$a) {}".
2) func_get_arg() and func_get args() return the current value of argument and not the original value that was sent.
* PHP-5.4:
Add built-in web server to invocation list
Terminology: change embedded web server to built-in web server to align with cli usage
Align -B and -E parameter names with cli usage (begin_code and end_code)
Fix Bug #65219 DBSETLDBNAME should be called before login to set DBNAME in login record
The process title change module keeps track of the locally allocated
environ, so it doesn't need to worry about when environ changes
underneath it, for example by putenv()/setenv()
# This is useful w/ distributors who like to build all things shared or don't
# provide the readline extension. Or if a user pefers readline's behavior over
# libedit which might be used by the distributor.
