get unique array from multidimentional array by value in php

1<?php
2    function super_unique($array,$key)
3    {
4       $temp_array = [];
5       foreach ($array as &$v) {
6           if (!isset($temp_array[$v[$key]]))
7           $temp_array[$v[$key]] =& $v;
8       }
9       $array = array_values($temp_array);
10       return $array;
11
12    }
13
14
15$arr="";
16$arr[0]['id']=0;
17$arr[0]['titel']="ABC";
18$arr[1]['id']=1;
19$arr[1]['titel']="DEF";
20$arr[2]['id']=2;
21$arr[2]['titel']="ABC";
22$arr[3]['id']=3;
23$arr[3]['titel']="XYZ";
24
25echo "<pre>";
26print_r($arr);
27echo "unique*********************<br/>";
28print_r(super_unique($arr,'titel'));
29
30?>
31

1$uniquePids = array_unique(array_map(function ($i) { return $i['pid']; }, $holder));