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<?php
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/*********************************
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RandomLib Version 1.0
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Programmed by : Chao Xu(Mgccl)
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E-mail :
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
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Website : http://www.webdevlogs.com
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Info : Please email me if there is any feature you want
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or there is any bugs. I will fix them as soon as possible.
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*********************************/
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class random{
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function add($string,$weight=1){
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$this->
data[] =
array('s' =>
$string,
'w' =>
$weight);
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}
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function optimize(){
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foreach($this->data as $var){
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if($new[$var['s']]){
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$new[$var['s']] += $var['w'];
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}else{
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$new[$var['s']] = $var['w'];
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}
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}
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foreach($new as $key=>$var){
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$this->
data[] =
array('s' =>
$key,
'w' =>
$var);
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}
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}
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function select($amount=1){
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if($amount == 1){
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$result = $this->data[$rand]['s'];
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}else{
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$i = 0;
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while($i<$amount){
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$result[] =
$this->
data[array_rand($this->
data)]['s'];
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++$i;
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}
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}
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return $result;
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}
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function select_unique($amount=1){
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if($amount == 1){
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$result = $this->data[$rand]['s'];
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}else{
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foreach($rand as $var){
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$result[] = $this->data[$var]['s'];
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}
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}
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return $result;
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}
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function select_weighted($amount=1){
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$count =
count($this->
data);
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$i = 0;
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$max = -1;
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while($i < $count){
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$max += $this->data[$i]['w'];
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++$i;
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}
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if(1 == $amount){
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$w = 0; $n = 0;
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while($w <= $rand){
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$w += $this->data[$n]['w'];
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++$n;
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}
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$key = $this->data[$n-1]['s'];
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}else{
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$i = 0;
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while($i<$amount){
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++$i;
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}
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$i = 0;
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$n = 0;
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$w = 0;
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while($i<$amount){
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while($w<=$random[$i]){
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$w += $this->data[$n]['w'];
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++$n;
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}
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$key[] = $this->data[$n-1]['s'];
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++$i;
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}
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}
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return $key;
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}
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function select_weighted_unique($amount=1){
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$count =
count($this->
data);
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$i = 0;
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if($amount >= $count){
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while($i < $count){
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$return[] = $this->data[$i]['s'];
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++$i;
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}
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return $return;
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}else{
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$max = -1;
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while($i < $count){
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$max += $this->data[$i]['w'];
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++$i;
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}
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$i = 0;
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while($i < $amount){
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$max -= $sub;
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$w = 0;
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$n = 0;
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while($w <= $num){
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$w += $this->data[$n]['w'];
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++$n;
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}
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$sub = $this->data[$n-1]['w'];
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$key[] = $this->data[$n-1]['s'];
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unset($this->
data[$n-1]);
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++$i;
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}
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return $key;
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}
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}
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}
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?>
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Here are the example
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<?php
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$starttime =
$timeparts[1].
substr($timeparts[0],
1);
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include ('class.random.php');
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$random = new random;
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$random->add('this have weight 1000, ', 1000);
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$random->add('this have weight 1, ', 1);
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$random->add('this have weight 200, ', 200);
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$random->add('this have weight 500, ', 500);
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?>
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The random items:<br />
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one weights 1000, one weights 1, one weights 200, one weights 500<br />
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Result for randomly select 1 item:<?=$random->select()?><br />
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Result for randomly select 3 item:
<? print_r($random->
select(3))?><br />
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Result for randomly select 3 unique item:
<? print_r($random->
select_unique(3))?><br />
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Result for weighted randomly select 1 item:<?=$random->select_weighted()?><br />
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Result for weighted randomly select 3 item:
<? print_r($random->
select_weighted(3))?><br />
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Result for weighted randomly select 3 unique item:
<? print_r($random->
select_weighted_unique(3))?><br />
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<?php
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$endtime =
$timeparts[1].
substr($timeparts[0],
1);
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echo 'time spent',
bcsub($endtime,
$starttime,
6);
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?>
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