/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

0 vote336 views1 answer
Old function use in checkbox selected in laravel blade
PHP Laravel
1 vote353 views2 answers
Laravel compare date timestamp
PHP Laravel
2 votes322 views1 answer
Change css in php
PHP
16 votes297 views3 answers
Laravel request validate
PHP
1 vote278 views1 answer
Laravel check if eloquent just created
PHP Laravel
0 vote333 views1 answer
Laravel new project command doesn't create vendor
PHP Laravel
0 vote329 views5 answers
Laravel tricks and tips
PHP
12 votes346 views4 answers
Read csv php
PHP
1 vote276 views3 answers
Woocommerce get post meta
PHP
21 votes306 views3 answers
How to get ip address of pc in php
PHP