count from several multidimensional arrays
Question
i have foreach, which generate following arrays:
==== array 1 ====
array
0 =>
array
'tag' => string 'daf' (length=3)
1 =>
array
'tag' => string 'daa' (length=3)
2 =>
array
'tag' => string 'daf' (length=3)
3 =>
array
'tag' => string 'daaa' (length=4)
4 =>
array
'tag' => string 'daf' (length=3)
5 =>
array
'tag' => string 'daa' (length=3)
6 =>
array
'tag' => string 'daf' (length=3)
7 =>
array
'tag' => string 'daf' (length=3)
8 =>
array
'tag' => string 'daf' (length=3)
9 =>
array
'tag' => string 'abd' (length=3)
10 =>
array
'tag' => string 'abdaa' (length=5)
11 =>
array
'tag' => string 'abda' (length=4)
==== array 2 ====
array
0 =>
array
'tag' => string 'daf' (length=3)
1 =>
array
'tag' => string 'test1' (length=5)
As output i want to get something like:
array
'daf' => '7'
'daa' => '2'
'daaa' => '1'
'abd' => '1'
'abdaa' => '1'
'abda' => '1'
'test1' => '1'
The value of the new array is the count of the element from all aray generatet from the loop. array_count_values() doesn't work here...any suggestions, how to solve the problem?
Solution
Something a bit like this should work:
$result = array();
foreach (array_merge($array1, $array2) as $item) {
$name = $item['tag'];
if (!isset($result[$name])) {
$result[$name] = 0;
}
$result[$name]++;
}
OTHER TIPS
Did not notice it was 2 dimensional array.
Here is another code.
var_export(
array_count_values(
call_user_func_array('array_merge', array_merge($array1, $array2))
)
);
Let's make some use of the Standard PHP Library (SPL).
You can "flatten" an array with an RecursiveArrayIterator and RecursiveIteratorIterator. As a result you get an iterator that visits each leaf of your n-dimensional array and still let's you access the actual key of the element. In the next step concat both RecursiveIteratorIterators with an AppendIterator acting like a single interator that visits each element in all of its inner (appended) iterators.
$ai = new AppendIterator;
$ai->append(new RecursiveIteratorIterator(new RecursiveArrayIterator($array1)));
$ai->append(new RecursiveIteratorIterator(new RecursiveArrayIterator($array2)));
$counters = array();
foreach($ai as $key=>$value) {
if ( 'tag'===$key ) {
// @ because I don't care whether this array element exists beforehand or not.
// $value has to be something that can be used as an array key (strings in this case)
@$counters[$value] += 1;
}
}
If you want you can even use a FilterIterator instead of the if('tag'===$key)
. But imho this doesn't increase the readability/value of the code ;-)