How do I count occurrence of duplicate items in array

Question

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}) ?>     

Answer 1

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 )