Summing for values in my array - php

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; }
}
?>

Answer 2

check this out.
<?php
$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
);
$ADDED_NEW = 0;
$ADDED_OLD = 0;
$ADD_LATER = 0;
foreach ($stats as $key => $value) {
if (preg_match("/ADDED_NEW_.*/", $key)) { $ADDED_NEW += $value; }
else if (preg_match("/ADDED_OLD_.*/", $key)) { $ADDED_OLD += $value; }
else if (preg_match("/ADD_LATER_.*/", $key)) { $ADD_LATER += $value; }
}
echo "$ADDED_NEW - $ADDED_OLD - $ADD_LATER";
?>
outputs:
32 - 20 - 24

Answer 3

Try this:
<?php
$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,
);
$accumulators = array
(
"ADDED_NEW" => 0,
"ADDED_OLD" => 0,
"ADD_LATER" => 0,
);
foreach($stats as $key => $value)
{
foreach(array_keys($accumulators) as $accumulator)
{
if(preg_match("#^${accumulator}#m", $key)){$accumulators[$accumulator] += $value;}
}
}
header('Content-Type: text/plain');
print_r($accumulators);
?>