note 60977 added to function.array-diff
| From: | Jappie at osu1 dot php dot net | Date: | Sun, 22 Jan 2006 03:26:32 +0000 |
| Subject: | note 60977 added to function.array-diff | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-102224@lists.php.net to get a copy of this message | ||
Even better:
<?php
# An extention to array_diff:
# It returns an array of all values not present in all arrays given. If '$strict' is true,
# it returns all values not present or not in the same order in all arrays given. The
# arrays to compare must be placed in another array, which is used as argument '$arrays'.
# Returns false if '$arrays' is invalid.
function array_rdiff ($arrays, $strict = false) {
# check if argument is valid.
if (!is_array ($arrays))
return false;
foreach ($arrays as $array)
if (!is_array ($array))
return false;
# set working variables
$diff = array ();
$amount = count ($arrays);
$needles = array_shift ($arrays);
# compare
for ($n = 0; $n < $amount; $n++) {
foreach ($needles as $needle) {
$found = true;
$positions = array ();
foreach ($arrays as $haystack) {
if (($pos = array_search ($needle, $haystack)) === false)
$found = false;
if ($strict)
$positions[] = $pos;
}
if (!$found)
$diff[] = $needle;
elseif ($strict && (count (array_unique ($positions)) > 1))
$diff[] = $needle;
}
$arrays[] = $needles;
$needles = array_shift ($arrays);
}
return array_unique ($diff);
}
$array1 = array (1, 2, 3);
$array2 = array (1, 2, 3);
$array3 = array (1, 3, 2);
?>
Doing: <?php print_r (array_rdiff (array ($array1, $array2, $array3))); ?> or <?php print_r
(array_rdiff (array ($array1, $array2, $array3), false)); ?> will result in:
Array
(
)
Doing: <?php print_r (array_rdiff (array ($array1, $array2, $array3), true)); ?> will result
in:
Array
(
[0] => 2
[1] => 3
)
----
Server IP: 194.109.193.119
Probable Submitter: 82.170.215.175
----
Manual Page -- http://www.php.net/manual/en/function.array-diff.php
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