The return of ini_set(memory_limit..) is the actual memory_limit in use, before changing?

Hi Experts!

I recently obtained that  this could be done to increase memory limit and then return to the original memory_limit

$oldvalue = ini_set('memory_limit','1024M');

//Restore
ini_set('memory_limit', $oldvalue);

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But I couldn't found it in documentation.

Since it could be a very critical operation in the server that uses only 128M,
Could you please confirm?

Thanks in advance!
Eduardo FuerteDeveloper and AnalystAsked:
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Ray PaseurCommented:
Could you please confirm?
Here is the man page:
http://php.net/manual/en/function.ini-set.php

Here is what it says about the return value:
Returns the old value on success, FALSE on failure.

Here is how to test the function:
$oldvalue = ini_set('memory_limit','1024M');
var_dump($oldvalue);
$newvalue =  ini_get('memory_limit');
var_dump($newvalue);

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HTH, ~Ray
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