foreach find duplicate values in associative array php code example

Example 1: get duplicate value from array php

$arr = array(1, 4, 6, 1, 8, 9, 4, 6);

$unique = array_unique($arr);

$duplicates = array_diff_assoc($arr, $unique);

print_r($duplicates);
Array ( [3] => 1 [6] => 4 [7] => 6 )

Example 2: filter duplicate associative array by value check in php

<?php
function unique_key($array,$keyname){

 $new_array = array();
 foreach($array as $key=>$value){

   if(!isset($new_array[$value[$keyname]])){
     $new_array[$value[$keyname]] = $value;
   }

 }
 $new_array = array_values($new_array);
 return $new_array;
}

// Array
$student_arr[] = array("name" => "Yogesh Singh","age"=>24);
$student_arr[] = array("name" => "Sonarika Bhadoria","age"=>24);
$student_arr[] = array("name" => "Anil Singh","age" => 23);
$student_arr[] = array("name" => "Mayank Patidar","age" => 25);
$student_arr[] = array("name" => "Anil Singh","age" => 19);

// Remove duplicate value according to 'name'
$student_unique_arr = unique_key($student_arr,'name');

echo "<pre>";
print_r($student_arr);
echo "</pre>";

echo "<b>Array after remove duplicate key</b>";
echo "<pre>";
print_r($student_unique_arr);
echo "</pre>";