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php get duplicate keys in array without using inbuilt function
<![CDATA[$arr = array(3,5,2,5,3,9);
foreach($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 . " ";
}
}]]>
php get keys of duplicate values in array
<![CDATA[<?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));
]]>
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