<?php
// this one is more efficient.
function array_duplicates($arr) {
if (!is_array($arr)) {
return false;
}
$duplicates = array();
sort($arr);
$count = count($arr) - 1; // ### last index won't have duplicate.
for ($i = 0; $i < $count; $i++) {
if ($arr[$i] == $arr[$i+1]) {
$duplicates[] = $arr[$i];
$i++; // ### Skip next index.
}
}
return $duplicates;
}
function array_duplicates($array) {
if(!is_array($array))
return false;
$duplicates = array();
$unique = array_unique($array);
if(count($array) > count($unique)) {
for($i = 0; $i < count($array); $i++) {
if(!array_key_exists($i, $unique)) {
$duplicates[] = $array[$i];
}
}
}
return $duplicates;
}
?>
Thursday, April 9, 2009
get duplicate values from an array
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