remove duplicate items from object php - php

Question

{"id":34,"first_name":"xus"}
{"id":34,"first_name":"xus"}
{"id":4,"first_name":"ABC"}
{"id":4,"first_name":"ABC"}
$newlist = [];
$values = [];
foreach ($appointment_list as $key => $value) {
# code...
$values[] = $value['users'];
foreach($values as $val){
$newlist[$val->id]=$values;
}
unset($newlist[$key][$values]);
}
I want to remove duplicate value from object show distinct value base on id and want to count duplicate exist of each id
Expected
id 34 has 2 duplicate
and it should return one object
{"id":34,"first_name":"xus", "count":2}
something like that

Answer 1

You can use array_reduce
$arr = array(
array("id" => 34,"first_name" => "xus"),
array("id" => 34,"first_name" => "xus"),
array("id" => 4,"first_name" => "ABC"),
array("id" => 4,"first_name" => "ABC"),
);
$result = array_reduce($arr, function($c, $v){
if ( !isset( $c[$v["id"]] ) ) {
$c[$v["id"]] = $v;
$c[$v["id"]]["count"] = 1;
} else {
$c[$v["id"]]["count"]++;
}
return $c;
}, array());
$result = array_values( $result );
echo "<pre>";
print_r( $result );
echo "</pre>";
This will result to:
Array
(
[0] => Array
(
[id] => 34
[first_name] => xus
[count] => 2
)
[1] => Array
(
[id] => 4
[first_name] => ABC
[count] => 2
)
)

Answer 2

The simplest way of doing this is to create an empty array and map your objects using "id" as a key.
Here's the working snippet
<?php
$objectsRaw = [];
$objectsRaw[] = '{"id":34,"first_name":"xus"}';
$objectsRaw[] = '{"id":34,"first_name":"xus"}';
$objectsRaw[] = '{"id":4,"first_name":"ABC"}';
$objectsRaw[] = '{"id":4,"first_name":"ABC"}';
# decode the json objects into PHP arrays
$objects = array_map(
function($objectJson) {
$object = json_decode($objectJson, true);
return $object;
},
$objectsRaw
);
# map the objects
$result = [];
foreach($objects as $object) {
if (array_key_exists($object['id'], $result) === false) {
$object['count'] = 1;
$result[$object['id']] = $object;
continue;
}
$result[$object['id']]['count']++;
}
# encode result
$resultRaw = array_map('json_encode', $result);
# would look like
# Array
# (
# [34] => {"id":34,"first_name":"xus","count":2}
# [4] => {"id":4,"first_name":"ABC","count":2}
# )
# reset array keys (if you need this)
$resultRaw = array_values($resultRaw);
# would look like
# Array
# (
# [0] => {"id":34,"first_name":"xus","count":2}
# [1] => {"id":4,"first_name":"ABC","count":2}
# )