下面来看一个php按照权重随机排序数据的例子,希望这个例子能对各位带来一些例子,有需要的进入看看吧.
例子,代码如下:
<?php /** * @param array $weight 权重 例如array('a'=>10,'b'=>20,'c'=>50) * @return string key 键名 */ function roll($weight = array()) { $roll = rand ( 1, array_sum ( $weight ) ); $_tmpW = 0; $rollnum = 0; foreach ( $weight as $k => $v ) { $min = $_tmpW; $_tmpW += $v; $max = $_tmpW; if ($roll > $min && $roll <= $max) { $rollnum = $k; break; } } return $rollnum; } $row=roll(array('a'=>10,'b'=>20,'c'=>50)); echo $row;

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