如果我从php中的字符串返回数据，字符串是否被清除？

Question

I have been using jQuery and php for a while, and just wondered something. Say I do a post to php then using a json encode I return data from php. Does the memory that the php was using get cleared.

For instance say in php I put 20,000 characters in a string eg

$test['something']="20,000"; //imagine this is a big text line.
echo json_encode($test);

Then in jQuery I might have something like

$.post("test.php", {},function(data) {
    alert(data.something);
},'JSON');

At the point it has returned to jQuery has the php memory been cleared of the 20,000 characters, and anything else I had in any strings?

Answer 1

Your question seems a bit strange to me!

Essentially because the ordinary way to do the job you're talking about is:

$test['something']="20,000"; //imagine this is a big text line.
echo json_encode($test);
exit; // note this additional statement!

(or, obviously, without this additional statement if the echo is the very last statement of the script)

In other words as soon it echoed the required data the server script stops, so asking if the memory is then cleared or not makes not sense.

So for your question to make sense it might mean that your script keeps active and does something else...? I'm curious about that.
Anyway, in that case, no, the memory is not cleared: $test keeps unchanged.