Question

I have an array like below, and I want to do the total of values in a specific manner where all values of ADDED_NEW_(.*) {regular expressions}, and similarly other values.
I have only specific vals like ADDED_NEW, ADDED_OLD, and ADD_LATER.

My array is like:

$stats = Array
(
    [ADDED_NEW_2012_06_12] => 16
    [ADDED_OLD_2012_06_12] => 10
    [ADD_LATER_2012_06_12] => 12
    [ADDED_NEW_2012_06_11] => 16
    [ADDED_OLD_2012_06_11] => 10
    [ADD_LATER_2012_06_11] => 12
)

Can you please tell me how can i obtain my result. I don’t know how to add such values using regex in php. Please help.

The output I am expecting is $ADDED_NEW = 32 (i.e. 16+16), $ADDED_OLD = 20 (i.e. 10+10) and $ADD_LATER = 24 (i.e. 12+12)

Answer 1

I believe you just want to add values of similar keys in which they all start with ADDED_NEW or ADDED_OLD or ADD_LATER I assume so we can just make 3 counters and just match for those in the key and add to the counters.

I don’t know much PHP but using manuals and my knowledge from Python, this is what I mustered up:

<?php
$ADDED_NEW = 0;
$ADDED_OLD = 0;
$ADD_LATER = 0;
foreach ($stats as $key => $value) {
    if (preg_match("ADDED_NEW_.*", $key)) { $ADDED_NEW += $value; }
    if (preg_match("ADDED_OLD_.*", $key)) { $ADDED_OLD += $value; }
    if (preg_match("ADD_LATER_.*", $key)) { $ADD_LATER += $value; }
}
?>