FAQ

On Tuesday 26 September 2006 06:32 am, Prometheus Prometheus wrote:
hiho@ll

i was just asking myself, if it is possible, to get the return value
of a function after the function calls "return" (or throws an
exception) and before the value is returned

example:
class A{
public function __construct(){}
public function __destruct(){
// here i want the return value like:
$retval = idontknowwhichfunction();
print $retval; // this print's "test"
}
}

function B(){
$classvar = new A();

return "test";
}

i thought it would be a very impressive function for that purpose
for what i would need it:
think about testing a big php application
calling hundreds of functions and debugging them takes very long
but if i could track the arguments (debug_back_trace() function) AND
the return values (that's what i'm asking for) i could run a complete
test and after this i could change the input values automated and
compare it with the output i got before

another option for this, would be just debugging of such applications
cause it can be boring to debug big applications and with such a
possibility i can reproduce the problem very fast and at any point
within my application

the question is:
Q1: how is the return value (return or throw) stored within php?
or another question would be: is it possible to write an
extension which can retrieve every variable set within my php
session? (i know of the security problems this produces, but until
know, i'm evaluating if it can work) and would be the return value
within this variables?
any hint on this would be great!
since it's possible to create a sandbox within php (runkit extension)
i think it should be possible to get the return value (or exception
object) before the calling function receives it, not?
Q2: maybe i didn't find it, but is there a finished php function
which i can use like debug_back_trace but for the return value?
Q3: anybody has another idea for such a "testing" or debugging
environment? the main advantage of such a system would be: i can
start debugging from any point within my code and i could very easily
create automated test's which can compare the result (what it is and
what it should be) "automated"

thx@ll
Oh sweet, something I know!

Return values are stored in zval *return_value. That's within any
function that follows the Zend format (i.e. ZEND_FUNCTION() macro to
declare it, returns value via the RETURN_*() macros).
--
Matt Sicker

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groupphp-internals @
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postedSep 26, '06 at 11:32a
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