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@urokuta
Last active August 29, 2015 14:02
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ad_ab_test.php
<?php
class AdAbTest {
private $templates = array();
public function addTemplate($template, $ratio) {
$this->templates[] = array(
"template" => $template,
"ratio" => $ratio,
);
}
public function calc() {
$sum = array_reduce($this->templates, function($sum, $e){$sum += $e["ratio"];return $sum;});
$rand = mt_rand(0, $sum -1);
$bound = 0;
foreach ($this->templates as $t) {
$next_bound = $bound + $t["ratio"];
if ($rand >= $bound && $rand < $next_bound) {
// print "DEBUG: bound matched ${bound} <= rand:${rand} < ${next_bound} \n";
return $t;
}
$bound = $next_bound;
}
throw new Exception("not matched rand:${rand}");
}
public function display() {
$tpl = $this->calc();
print "display template : ${tpl["template"]} \n";
}
}
function test() {
$ad = new AdAbTest();
$ad->addTemplate("<span>r15</span>", 15);
$ad->addTemplate("<span>r25</span>", 25);
$ad->addTemplate("<span>r60</span>", 60);
$ad->display();
$result = array();
for ($i = 0;$i < 1000000; $i++) {
$tpl = $ad->calc();
$result[] = $tpl["ratio"];
}
$stat = array_count_values($result);
var_dump($stat);
}
test();
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