/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 vote117 views1 answer
Laravel validating birthdate by 13 years old
PHP Laravel
0 vote89 views1 answer
Pagination javascript php
PHP
0 vote100 views1 answer
Disable Specific Plugin Update
PHP
0 vote63 views1 answer
Blob symfony
PHP
1 vote103 views1 answer
Php absolute value
PHP
1 vote98 views2 answers
Array length php for loop
PHP
0 vote98 views1 answer
Remove all items of an array except the last 5 in php
PHP
0 vote109 views1 answer
Trying to access variable outside laravel collection
PHP Laravel
0 vote133 views1 answer
Laravel eloquent where value less then 5 and greter then 0
PHP Laravel
8 votes94 views2 answers
Twig dd
PHP