废话不多说了,一切解释尽在代码中,具体代码如下所示:
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/** * @param $total [你要发的红包总额] * @param int $num [发几个] * @return array[生成红包金额] */ function getRedGift( $total , $num = 10) { $min = 0.01; $wamp = array (); $returnData = array (); for ( $i = 1; $i < $num ; ++ $i ) { $safe_total = ( $total - ( $num - $i ) * $min ) / ( $num - $i ); //红包金额的最大值 if ( $safe_total < 0) break ; $money = @mt_rand( $min * 100, $safe_total * 100) / 100; //随机产生一个红包金额 $total = $total - $money ; //剩余红包总额 $wamp [ $i ] = round ( $money , 2); //保留两位有效数字 } $wamp [ $i ] = round ( $total , 2); $returnData [ 'MoneySum' ] = $wamp ; $returnData [ 'newTotal' ] = array_sum ( $wamp ); return $returnData ; } //测试 $data = getRedGift(100, 10); print_r( $data ); //result: /* Array ( [1] => 8.7 [2] => 10.09 [3] => 6.23 [4] => 6.87 [5] => 0.47 [6] => 3.12 [7] => 7.52 [8] => 12.21 [9] => 20.53 [10] => 24.26 )*/ |
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