如何随机生成一个长尾词，其出现概率随时间推移而逐渐降低的值？

本文共计91个文字，预计阅读时间需要1分钟。

php 10, 'sina'=> 30, 'qq'=> 20, 'baidu'=> 20);echo randomBaseTimestamp($config);

function randomBaseTimestamp($data=array()) { uasort($data, function($a, $b) { return rand(-1, 1); }); $time=time(); $total=array_sum($data);}?>

$config = array( 'sohu' => 10, 'sina' => 30, 'qq' => 20, 'baidu' => 20, ); echo randomBaseTimestamp($config); function randomBaseTimestamp($data = array()) { uasort($data, function ($a, $b) { return rand(-1, 1); }); $time = time(); $total = array_sum($data); $mod = $time%$total; $result = ''; foreach($data as $k => $v) { $result = $k; $mod -= $v; if($mod<=0) { break; } } return $result; }