Combining arrays with common values - php

Question

I have an array of dates that looks like this:
Array
(
[0] => '2014-01-01'
[1] => '2014-01-02'
[2] => '2014-01-03'
[3] => '2014-01-04'
[4] => '2014-01-05'
[5] => '2014-01-06'
[6] => '2014-01-07'
)
and I have another array of dates and counts that looks like this:
[All] => Array
(
[0] => Array
(
[count] => 2
[date] => 2014-01-06
)
[1] => Array
(
[count] => 1
[date] => 2014-01-03
)
[2] => Array
(
[count] => 43
[date] => 2013-12-11
)
[3] => Array
(
[count] => 103
[date] => 2013-12-10
)
[4] => Array
(
[count] => 128
[date] => 2013-12-09
)
[5] => Array
(
[count] => 75
[date] => 2013-12-08
)
[6] => Array
(
[count] => 107
[date] => 2013-12-07
)
I want to make a new associative array where all the keys are the dates from the first array above and all of the values are either the count matched up with the corresponding date or "0".
So for instance, the new array would look like this:
Array
(
[2014-01-01] => 0
[2014-01-02] => 0
[2014-01-03] => 1
[2014-01-04] => 0
[2014-01-05] => 0
[2014-01-06] => 2
[2014-01-07] => 0
)
Does that make sense? Please feel free to ask any questions you may have. Thank you!

Answer 1

Try this code:
$result = array();
foreach($firstArray as $f){
foreach($secondArray as $s){
if($s['date'] == $f) $result[$f] = $s['count'];
}
if(!array_key_exists($f, $result)) $result[$f] = 0;
}

Answer 2

$result = array();
foreach($secondArray as $s){
if(in_array($s['date'], $firstArray) {
unset($firstArray[$s['date']]);
$result[$s['date']] = $s['count'];
}
}
// if items left in first array that are not found within foreach:
if (!empty($firstArray))
$result = array_merge($result, array_fill_keys($firstArray, 0));
// sort by key so dates go ascending
ksort($result);

Answer 3

$new = array();
foreach($all as $row)
{
$new[$row['date']] = $row['count'];
}
array_merge ($new, $old);
Here $all is the array with the date and count indices.
$old is the exisisting array.

Answer 4

That's a 2-liner:
// use dates as index and set everything to 0
$result = array_fill_keys($x, 0));
// copy over existing counts
array_walk($all, function($v) use (&$result) { if (array_key_exists($v['date'], $result)) { $result[$v['date']] = $v['count'];}});