note 71719 modified in function.array-unique by james
| From: | james@php.net | Date: | Fri, 19 Oct 2007 02:12:02 +0000 |
| Subject: | note 71719 modified in function.array-unique by james | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-131527@lists.php.net to get a copy of this message | ||
What if I only want the duplicated items, not the unique ones?
I tried to do it by using array_diff of an array and its unique, but it did not work (any help?); so
I made this function with a relatively good efficiency:
<?php
function array_repeated($array) {
if(!is_array($array)) return false;
$repeated_values = Array();
$array_unique = array_unique($array);
if(count($array)-count($array_unique)) {
for($i=0;$i<count($array);$i++) {
if(!array_key_exists($i, $array_unique)) $repeated_values[] = $array[$i];
}
}
return $repeated_values;
}
?>
This function is based on the behaviour of the array_unique function that mantains the indexes of
the array when deleting the item.
--was--
What if I only want the duplicated items, not the unique ones?
I tried to do it by using array_diff of an array and its unique, but it did not work (any help?); so
I made this function with a relatively good efficiency:
function array_repeated($array) {
if(!is_array($array)) return false;
$repeated_values = Array();
$array_unique = array_unique($array);
if(count($array)-count($array_unique)) {
for($i=0;$i<count($array);$i++) {
if(!array_key_exists($i, $array_unique)) $repeated_values[] = $array[$i];
}
}
return $repeated_values;
}
This function is based on the behaviour of the array_unique function that mantains the indexes of
the array when deleting the item.
http://php.net/manual/en/function.array-unique.php