php get duplicate keys in array without using inbuilt function
$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 )
4.6
10
<?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));
Thank you!
10
4.6
(10 Votes)
0
4.22
10
$arr = array(3,5,2,5,3,9);
foreach($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 . " ";
}
}
Thank you!
10
4.22
(9 Votes)
0
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