How do I count occurrence of duplicate items in array
arrays, count, php
Solution
`array_count_values`, enjoy :-)
$array = array(12,43,66,21,56,43,43,78,78,100,43,43,43,21);
$vals = array_count_values($array);
echo 'No. of NON Duplicate Items: '.count($vals).'<br><br>';
print_r($vals);
Result:
No. of NON Duplicate Items: 7
Array
(
[12] => 1
[43] => 6
[66] => 1
[21] => 2
[56] => 1
[78] => 2
[100] => 1
)
Problem
I would like to count the occurrence of each duplicate item in an array and end up with an array of only unique/non duplicate items with their respective occurrences. Here is my code; BUT I don't where am going wrong! ``` <?php $array = array(12,43,66,21,56,43,43,78,78,100,43,43,43,21); //$previous[value][Occurrence] for($arr = 0; $arr < count($array); $arr++){ $current = $array[$arr]; for($n = 0; $n < count($previous); $n++){ if($current != $previous[$n][0]){// 12 is not 43 -----> TRUE if($current != $previous[count($previous)][0]){ $previous[$n++][0] = $current; $previous[$n++][1] = $counter++; } }else{ $previous[$n][1] = $counter++; unset($previous[count($previous)-1][0]); unset($previous[count($previous)-1][1]); } } } //EXPECTED VALUES echo 'No. of NON Duplicate Items: '.count($previous).'<br><br>';// 7 print_r($previous);// array( {12,1} , {21,2} , {43,6} , {66,1} , {56,1} , {78,2} , {100,1}) ?> ```