Hello Everyone,
I would like to sort a list of array indices. The array is multi-
dimensional N x 3
for example, if (note the actual data is not important to my question):
$a[0]['a'] = 1, $a[0]['b'] = 2, $a[0]['c'] = 3
$a[1]['a'] = 1, $a[1]['b'] = 2, $a[1]['c'] = 3
$a[2]['a'] = 1, $a[2]['b'] = 2, $a[2]['c'] = 3
Q1) I will use the "usort" user sort function. I see the example for
multi-dimensional arrays in the manual (they use fruits, not a b c). Does
usort work in Windows (NT4 machine, PHP 4.04, running as cgi) ?
Q2) The array $a will be stored in a session. I will want to clear $a and
then recreate and resort $a. How do I clear a variable or array ?
For example, if the first time I create $a it gets up to $a[30] (remember
$a is saved in a session), but if I recreate $a and the indices only go to
$a[20], I need to be sure $a[21] to $a[30] no longer exist. Easiest way:
clear $a before recreating it.
Q3) The $a array will be generated from the results of a mysql database
query. Is it realistic to save the results set ($res) of a query ($res =
mysql_query($sql)) in a session? I think the size of $res won't exceed
32KB. Is there a session storage size limit for Windows?
Thanks very much for your experience,
Barry.
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