/PHP/Php get duplicate keys in array without using inbuilt function

Php get duplicate keys in array without using inbuilt function

Php get keys of duplicate values in array

<?php
/** 
	Examples of these functions:
	array_unique, 
    array_diff_assoc, 
    array_diff, 
    array_keys, 
    array_intersect 
    
    Examle with an array: 
*/
$array = array('a', 'a', 'b', 'c', 'd');

// Unique values
$unique = array_unique($array);

// Duplicates
$duplicates = array_diff_assoc($array, $unique);

// Unique values
$result = array_diff($unique, $duplicates);

// Get the unique keys
$unique_keys = array_keys($result);

// Get duplicate keys
$duplicate_keys = array_keys(array_intersect($array, $duplicates));

Source: stackoverflow.com

Php get duplicate keys in array without using inbuilt function

$arr = array(3,5,2,5,3,9);
foreach($arr as $key => $val){
  //remove the item from the array in order 
  //to prevent printing duplicates twice
  unset($arr[$key]); 
  //now if another copy of this key still exists in the array 
  //print it since it's a dup
  if (in_array($val,$arr)){
    echo $val . " ";
  }
}

Similar codes

-1 vote348 views3 answers
Codeigniter pagination example
PHP
0 vote308 views1 answer
Php css not updating
PHP
0 vote319 views1 answer
Laravel hiding attributes JSON
PHP
0 vote356 views1 answer
Laravel routes return view in web.php
PHP Laravel
0 vote376 views3 answers
How to add posts to php
PHP
0 vote362 views6 answers
Socialite laravel 7
PHP Laravel
0 vote325 views1 answer
What is WP_USE_THEMES
PHP
4 votes378 views1 answer
How to check query execution time in laravel
PHP Laravel
0 vote367 views1 answer
Creating default object from empty value laravel
PHP Laravel
0 vote340 views1 answer
Laravel 8 - get values of url query strings in controller
PHP