/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 vote265 views1 answer
Laravel child relation get max value
PHP
0 vote265 views1 answer
Implode remove empty php
PHP
0 vote269 views1 answer
Php array longest string
PHP
0 vote281 views3 answers
Remove string after comma in php
PHP
5 votes250 views2 answers
Exec output php
PHP
0 vote305 views1 answer
CakeResque::enqueue
PHP
3 votes275 views4 answers
Laravel where has Relation
PHP Laravel
0 vote274 views1 answer
Toggle switch php
PHP
11 votes287 views3 answers
Laravel get last 5 records
PHP
4 votes317 views3 answers
Delete all records from table using button laravel Eloquent
PHP Laravel