note 77065 added to function.rand
| From: | alishahnovin at hotmail dot com | Date: | Mon, 13 Aug 2007 17:39:16 +0000 |
| Subject: | note 77065 added to function.rand | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-129450@lists.php.net to get a copy of this message | ||
Quick function that returns an array of unequal random numbers. Works well if you need to assign
random values, but want them to all be unique.
<?php
function randiff($min, $max, $num) {
if ($min<$max && $max-$min+1 >= $num && $num>0) {
$random_nums = array();
$i=0;
while($i<$num) {
$rand_num = rand($min, $max);
if (!in_array($rand_num, $random_nums)) {
$random_nums[] = $rand_num;
$i++;
}
}
return $random_nums;
} else {
return false;
}
}
?>
So rather than:
<?php
$var1 = rand(0,10);
$var2 = rand(0,10);
?>
Which could potentially give you two of the same values, you can use:
<?php
$nums = randiff(0,10,2);
$var1 = $nums[0];
$var2 = $nums[1];
?>
----
Server IP: 66.207.199.35
Probable Submitter: 204.244.149.125
----
Manual Page -- http://www.php.net/manual/en/function.rand.php
Edit -- https://master.php.net/note/edit/77065
Del: integrated -- https://master.php.net/note/delete/77065/integrated
Del: useless -- https://master.php.net/note/delete/77065/useless
Del: bad code -- https://master.php.net/note/delete/77065/bad+code
Del: spam -- https://master.php.net/note/delete/77065/spam
Del: non-english -- https://master.php.net/note/delete/77065/non-english
Del: in docs -- https://master.php.net/note/delete/77065/in+docs
Del: other reasons-- https://master.php.net/note/delete/77065
Reject -- https://master.php.net/note/reject/77065
Search -- https://master.php.net/manage/user-notes.php