Count and remove duplicate arrays - php

Question

I'm trying to count and remove duplicate arrays. To be a duplicate the entire array would have the match in keys and values with another.
Array
(
[0] => Array
(
[name] => Superman
[time] => 60
)
[1] => Array
(
[name] => Superman
[time] => 60
)
[2] => Array
(
[name] => Superman
[time] => 50
)
[3] => Array
(
[name] => Superman
[time] => 40
)
[4] => Array
(
[name] => Superman
[time] => 50
)
[5] => Array
(
[name] => Superman
[time] => 60
)
)
Into:
Array
(
[0] => Array
(
[name] => Superman
[time] => 60
[count] => 3
)
[1] => Array
(
[name] => Superman
[time] => 50
[count] => 2
)
[2] => Array
(
[name] => Superman
[time] => 40
)
)
I've come across this answer that can remove the duplicates, but I'm struggling to see how I may count them.
$input = array_map("unserialize", array_unique(array_map("serialize", $input)));

Answer 1

Quick and dirty, but you get exactly the data structure you asked for:
$data = array(
array("name" => "Superman", "time" => 60),
array("name" => "Superman", "time" => 60),
array("name" => "Superman", "time" => 50),
array("name" => "Superman", "time" => 40),
array("name" => "Superman", "time" => 50),
array("name" => "Superman", "time" => 60),
);
// count the occurrences
$occurrences = array();
for ($i = 0, $l = count($data); $i < $l; $i++) {
$serialized = serialize($data[$i]);
if (!isset($occurrences[$serialized])) {
$occurrences[$serialized] = 1;
}
else {
$occurrences[$serialized] = $occurrences[$serialized] + 1;
}
}
// get the wanted structure
$uniques = array();
foreach ($occurrences as $serialized => $count) {
$unserialized = unserialize($serialized);
if ($count > 1) {
$unserialized['count'] = $count;
}
$uniques[] = $unserialized;
}
print_r($uniques);

Answer 2

Not as compact as I would like, but it gets the job done:
function unserialize_unique_count($input, $k = 'count') {
$a = [];
foreach ($input as $d) {
$s = serialize($d);
$a[$s] = (isset($a[$s]) ? ($a[$s] + 1) : 1);
}
foreach ($a as $s => $c) {
$a[$s] = unserialize($s) + [ $k => $c ];
}
return array_values($a);
}
$grouped_with_count = unserialize_unique_count($input);
How it works: The first loop serializes and counts. The second unique merges. O(n).
How to use: Pass your multi-dimensional array as argument #1. Gives you back uniques with an additional key "count" that holds the count. If you want the count key to be something other than "count", pass the function a second argument.

Answer 3

You can use array_count_values in this case too. Example:
$values = array(
array('name' => 'Superman', 'time' => 60),
array('name' => 'Superman', 'time' => 60),
array('name' => 'Superman', 'time' => 50),
array('name' => 'Superman', 'time' => 40),
array('name' => 'Superman', 'time' => 50),
array('name' => 'Superman', 'time' => 60),
);
// map out into string then unique them
$uniques = array_map("unserialize", array_unique(array_map("serialize", $values)));
$count = array_count_values(array_map("serialize", $values)); // map out the arrays then get the counts
// then to merge the count
foreach($uniques as &$batch) {
foreach($count as $array => $v) {
if(unserialize($array) == $batch) { // if this particular key count is equal to this unique array, then push the count
$batch['count'] = $v;
}
}
}
echo '<pre>';
print_r($uniques);
Sample Output

Answer 4

Get Array and its values
make unique key on paypal_address
Use unique key to create temp array
Store all values with respective unique key in temp array
I am using time as unique key.
$tmpArr = Array();
$cnt = sizeof($arr);
for($i=0;$i<$cnt;$i++){
$time = $arr[$i]['time'];
if(!is_array($tmpArr[$time])){
$tmpArr[$time] = Array();
$tmpArr[$time]['count'] = 0;
}
$tmpArr[$time]['time'] = $arr[$i]['time'];
$tmpArr[$time]['name'] = $arr[$i]['name'];
$tmpArr[$time]['count'] = $tmpArr[$time]['count'] + 1;
}
print_r($tmpArr);
Note: Make changes in code according to your requirement