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PHP : Function Reference : Array Functions : array_count_values

array_count_values

Counts all the values of an array (PHP 4, PHP 5)
array array_count_values ( array input )

array_count_values() returns an array using the values of the input array as keys and their frequency in input as values.

Parameters

input

The array of values to count

Return Values

Returns an assosiative array of values from input as keys and their count as value.

Errors/Exceptions

Throws E_WARNING for every element which is not string or integer.

Examples

Example 236. array_count_values() example

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<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

The above example will output:

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Array
(
   [1] => 2
   [hello] => 2
   [world] => 1
)


See Also
count()
array_unique()
array_values()
count_chars()

Related Examples ( Source code ) » array_count_values

Examples ( Source code ) » String word count and frequency
Examples ( Source code ) » Array count value

Code Examples / Notes » array_count_values

manuzhai
You might use serialize() to serialize your objects before analyzing their frequency. :)

tschneider
This does not works with objects. If you have an array filled with objects, you can not count them.
Example:
<?php
$myArray = array();
for ($i = 0 ; $i < 10 ; $i++)
{
  $myObject = new MyObject();
  $myArray[$i] = $myObject;
}
echo (array_count_values($myArray));
?>
This gives you:
Warning: Can only count STRING and INTEGER values...
Found no solution for this yet...

jon
suggested plan of attack:
<pre>
<?
class MyObject {
   function MyObject($t = 'none')
   {
     $this->$myTag = $t;
   }
}
$myArray = array();
for ($i = 1 ; $i < 11 ; $i++)
{
  $myobj = new MyObject( str_pad('n', $i, 'x') );
  $myArray[ $myobj->$myTag ] = $myobj;
}
print_r( array_count_values(array_keys($myArray)) );
?>
to sum up:
assuming each instance of an object you create has some sort of tag, e.g.,
$this->$myTag=get_class($this)
..you should be set. objects dont have value to compare the way strings and integers do, so, $myTag's value is arbitrary.

meyermagic
Scratch that, I did something stupid. Here is a better function.
<?php
function array_enumerate_keys($array)
{
$index = 0;
$enumerated = array();
$values = array_values($array);
$keys = array_keys($array);
for($index = 0; $index < count($array); $index++)
{
$iteration;
for($iteration = 0; $iteration < $values[$index]; $iteration++)
{
$enumerated = array_merge($enumerated, array($keys[$index]));
}
}

return $enumerated;
}
?>

blauauge
my solution for count  on multidimentional arrays.
<?php
 for($i = 0; $i < count($array); $i++) {
     $detail = explode("|", $array[$i]);
     echo "$i - $detail[0] - $detail[1]
";
     if($detail[1] == '1') { $wieoft1 = $wieoft1 +=1; }
     if($detail[1] == '2') { $wieoft2 = $wieoft2 +=1; }
     if($detail[1] == '3') { $wieoft3 = $wieoft3 +=1; }
 }
 echo ". $wieoft1 : $wieoft2 : $wieoft3";
?>
looks not pretty fine yet works great for me.
make it bigger for your own.

alwaysdrunk
if you have too many values in $_POST,$_GET array that needs to be controlled with isset() in oreder to understand the form is filled completely and have no empty text boxes.
you can try this,it saves time.
<?
$n = array_count_values($_POST);
if (!isset($n[''])) {
echo "The form is filled completely";
}
else
{ die("Please fill the form comlpetely"); }
//tested in php 5
?>

digleu
I fount a solution for the count of array elements in the sense of array_count_values, but i was not able to use the function array_count_values itself because it does not say me if arrays exists in the given array, so i had to use a foreach loop and a little bit of recursivity ;)
<?php
function array_count_values_multidim($a,$out=false) {
 if ($out===false) $out=array();
 if (is_array($a)) {
   foreach($a as $e)
     $out=array_count_values_multidim($e,$out);
 }
 else {
   if (array_key_exists($a,$out))
     $out[$a]++;
   else
     $out[$a]=1;
 }
 return $out;
}
?>

mr.a
I find a very simple solution to count values in multidimentional arrays (example for 2 levels) :
foreach ($array as $a) {
 foreach ($a as $b) {
   $count_values[$b]++;
 }
}

rabies dot dostojevski
I couldn't find a function for counting the values with case-insensitive matching, so I wrote a quick and dirty solution myself:
<pre><?php
function array_icount_values($array) {
$ret_array = array();
foreach($array as $value) {
foreach($ret_array as $key2 => $value2) {
if(strtolower($key2) == strtolower($value)) {
$ret_array[$key2]++;
continue 2;
}
}
$ret_array[$value] = 1;
}
return $ret_array;
}
$ar = array('J. Karjalainen', 'J. Karjalainen', 60, '60', 'J. Karjalainen', 'j. karjalainen', 'Fastway', 'FASTWAY', 'Fastway', 'fastway', 'YUP');
$ar2 = array_count_values($ar); // Normal matching
$ar = array_icount_values($ar); // Case-insensitive matching
print_r($ar2);
print_r($ar);
?></pre>
This prints:
Array
(
   [J. Karjalainen] => 3
   [60] => 2
   [j. karjalainen] => 1
   [Fastway] => 2
   [FASTWAY] => 1
   [fastway] => 1
   [YUP] => 1
)
Array
(
   [J. Karjalainen] => 4
   [60] => 2
   [Fastway] => 4
   [YUP] => 1
)
I don't know how efficient it is, but it seems to work. Needed this function in one of my scripts and thought I would share it.

byron
I am building a script for a quiz, and could not find any answers to count the number of times a value was repeated in an array, and came up with the following function.
<?php
// Answers Array
$array = array('a', 'b', 'a', 'a', 'c', 'a', 'd', 'a', 'c', 'd');
// Start Count Function
function count_repeat_values($needle, $haystack){

$x = count($haystack);

for($i = 0; $i < $x; $i++){

if($haystack[$i] == $needle){
$needle_array[] = $haystack[$i];
}
}

$number_of_instances = count($needle_array);

return $number_of_instances;
}
echo count_repeat_values('a', $array);
// will return the value 5
?>
But after writing the function, I happened to stroll upon array_count_values() which I had completely forgotten about.
I know that i could get the value by doing this:
<?php
$array = array('a', 'b', 'a', 'a', 'c', 'a', 'd', 'a', 'c', 'd');
$answer = array_count_values($array);
echo $answer['a']
?>
Would be interesting to see which version works quicker...

programmer
array_count_values returns the number of keys if empty(value). I expected array_count_values to return 0 for empty values.
Array looks like:
Array
       (
           [459] =>
           [543] =>
           [8959] =>
           [11273] =>
       )
array_count_values returns:
Array
(
   [] => 4
)
count(array_count_values(array)) does thus not report there are no values (other than empty) in the array.
I therefore check:
$arrFoo=array_count_values($arrBar);
if(isset($arrFoo[""]) $allempty=count($arrBar)==$arrFoo[""];
if(!$allempty)
//process the array
else
//no need to work on the array

pmarciatigeneticsimediharvardiedu
array_count_values function does not work on multidimentional arrays.
If $score[][] is a bidimentional array, the command
"array_count_values ($score)" return the error message "Warning: Can only count STRING and INTEGER values!".

coda
alwaysdrunk's comment only works if you can trust the client web browser. Using this function doesn't validate that every necessary field exists -- only that every field that was submitted has a value in it. Thus if an attacker wished to force a null value into one of the fields, he could (rather easily) construct a modified form without the field and submit THAT.
Besides, you really ought to be validating each field anyway if you're taking user input.

meyermagic
A possible inverse function for array_count_values
<?php
function array_enumerate_keys($array)
{
$index;
$enumerated;
$values = array_values($array);
$keys = array_keys($array);
for($index = 0; $index < count($array); $index++)
{
$iteration;
for($iteration = 0; $iteration < $values[$index]; $iteration++)
{
$enumerated .= $keys[$index] . ',';
}
}

return explode(',', $enumerated);
}
?>

majerm
<?
function array_icount_values($array) {
   $ret_array = array();
   foreach($array as $value) $ret_array[strtolower($value)]++;
   return $ret_array;
}
$ar = array('J. Karjalainen', 'J. Karjalainen', 60, '60', 'J. Karjalainen', 'j. karjalainen', 'Fastway', 'FASTWAY', 'Fastway', 'fastway', 'YUP');
$ar = array_icount_values($ar);
?>
this prints:
Array
(
   [j. karjalainen] => 4
   [60] => 2
   [fastway] => 4
   [yup] => 1
)

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