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    lt  php  array   array 12 43 66 21 56 43 43 78 78 100 43 43 43 21       previous value  Occurrence   for  arr   0   arr  lt  count  array    arr           current    array  arr       for  n   0   n  lt  count  previous    n             if  current     previous  n  0      12 is not 43 ----- gt  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    lt br gt  lt br gt      7 print r  previous     array   12 1     21 2     43 6     66 1     56 1     78 2     100 1     gt

User · Answer

There is a magical function PHP is offering to you it called in_array().

Using parts of your code we will modify the loop as follows:

<?php
$array = array(12,43,66,21,56,43,43,78,78,100,43,43,43,21);
$arr2 = array();
$counter = 0;
for($arr = 0; $arr < count($array); $arr++){
    if (in_array($array[$arr], $arr2)) {
        ++$counter;
        continue;
    }
    else{
        $arr2[] = $array[$arr];
    }
}
echo 'number of duplicates: '.$counter;
print_r($arr2);
?>

The above code snippet will return the number total number of repeated items i.e. form the sample array 43 is repeated 5 times, 78 is repeated 1 time and 21 is repeated 1 time, then it returns an array without repeat.

User · Answer

if you want to try without  array count values  you can do with a smart way here   lt  php  input  array 12 43 66 21 56 43 43 78 78 100 43 43 43 21     count values   array    foreach   input as  a            count values  a        echo  Duplicates count    count  count values   print r  count values     gt

User · Answer

I actually wrote a function recently that would check for a substring within an array that will come in handy in this situation   function strInArray  haystack   needle         i   0      foreach   haystack as  value             result   stripos  value  needle           if   result     FALSE  return TRUE           i              return FALSE      array   array 12 43 66 21 56 43 43 78 78 100 43 43 43 21    for   i   0   i  lt  count  array    i          if  strInArray  array  array  i              unset  array  i            var dump  array

User · Answer

You can do it using foreach loop              arrayVal   array 1 2 3 1 2 3 1 2 3 4 4 5 6 4 5 6 88              set array   array              foreach   array as  value                 set array  value                            print r  set array     Output  -    Array   1    gt  3               2    gt  3               3    gt  3               4    gt  3               5    gt  2               6    gt  2               88    gt  1

User · Answer

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    lt br gt  lt br gt    print r  vals     Result   No  of NON Duplicate Items  7 Array        12    gt  1      43    gt  6      66    gt  1      21    gt  2      56    gt  1      78    gt  2      100    gt  1

User · Answer

input    1 2 1 3 2 4 10         if give string        input    hello hello how are you how hello          array   explode      input        count val           foreach  array as  val          count val  val               print r  count val     output    1    gt  2  2    gt  2  3    gt  1  4    gt  1  10    gt  1

User · Answer

search string   4   original array    1 2 1 3 2 4 4 4 4 4 10    step1   implode       original array      convert original array to string  step2   explode  search string   step1      break step1 string into a new array using the search string as delimiter  result   count  step2 -1     count the number of elements in the resulting array  minus the first empty element print r  result      result is 5

User · Answer

this code will return duplicate value in same array   array   array 12 43 66 21 56 43 43 78 78 100 43 43 43 21   foreach  arr as  key  gt  item     if array count values  arr   item   gt  1        echo  Found Matched value      item    lt br   gt

User · Answer

I came here from google looking for a way to count the occurence of duplicate items in an array  Here is the way to do it simply    colors   array  red    green    blue    red    yellow    blue     unique colors   array unique  colors       unique colors   array  red    green    blue    yellow    duplicates   count  colors  - count  unique colors       duplicates   6 - 4   2 if   duplicates    0     echo  There are no duplicates     echo  No  of Duplicates are       duplicates      Output  No  of Duplicates are  2   How array unique   works   It elements all the duplicates  ex  Lets say we have an array as follows -    cars   array   0   gt  lambo    1   gt  ferrari    2   gt  Lotus    3   gt  ferrari    4   gt  Bugatti     When you do  cars   array unique  cars   cars will have only following elements   cars   array   0   gt  lambo    1   gt  ferrari    2   gt  Lotus    4   gt  Bugatti     To read more  https   www w3schools com php func array unique asp  Hope it is helpful to those who are coming here from google looking for a way to count duplicate values in array

User · Answer

Count duplicate element of an array in PHP without using in-built     function       arraychars array  or   red   yellow   green   red   yellow   yellow     arrCount array            for  i 0  i lt  arrlength-1  i                         key  arraychars  i             if  arrCount  key  gt  1                               arrCount  key                   else                 arrCount  key  1                    echo  arraychars  i    lt br gt                   echo   lt pre gt            print r  arrCount

User · Answer

You can also use it with text items array  u will get number of duplicates properly  but PHP shows     Warning  array count values    Can only count STRING and INTEGER   values     domains    array     0   gt   i1 wp com     1   gt   i1 wp com     2   gt   i2 wp com     3   gt   i0 wp com     4   gt   i2 wp com     5   gt   i2 wp com     6   gt   i0 wp com     7   gt   i2 wp com     8   gt   i0 wp com     9   gt   i0 wp com       tmp   array count values  domains   print r   tmp        array          i1 wp com    gt  2730         i2 wp com    gt  2861         i0 wp com    gt  2807

User · Answer

If you have a multi-dimensional array you can use on PHP 5 5  this   array count values array column  array   key      which returns e g          keyA    gt  4      keyB    gt  2

[php] How do I count occurrence of duplicate items in array

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