【来自媳妇的需求】PHP实现随机数和方程求解

<?php

//运行
echo "开始运行 \n";
run();
echo "运行结束 \n";

function run()
{/*{{{*/
    $data = array(40.9, 40.5, 44.3, 47.8, 48.5, 42.1, 46.2);
    $res = array();
    foreach($data as $key)
    {/*{{{*/
        echo "处理 {$key}\n";
        $resX = createX($key);
        foreach($resX as $keyX)
        {
            $keyStr = (string)$key;
            $keyXStr = (string)$keyX;
            $res[$keyStr][$keyXStr] = createParams4M($keyX);
        }


    }/*}}}*/

error_log(print_r($res,true)."\n", 3, ‘/tmp/result.log‘);
var_dump(99999,$res);exit;
    return $res;
}/*}}}*/

//1.产生平均数
function createX($ave)
{/*{{{*/
    $sum = 3*($ave * 1000);
    $x1 = $x2 = $x3 = 0;
    $rand4X1X2 = rand(0, 300);
    //$x2 > $x1 > $x3;
    for($i=0; $i< $ave * 1000 + 550; $i++)
    {
        $x2 = $i;
        $x1 = $x2 - $rand4X1X2;
        $x3 = $sum -($x1 + $x2); 
        $positive = $x1 > 0 && $x2 > 0 && $x3 > 0; 
        $flag = ($x2- $x3 < 400 && $x2 - $x3 > 200);

        if($positive && $flag)
        {
            //echo "捕捉到\n";
            $roundX1 = round($x1/1000, 1);
            $roundX2 = round($x2/1000, 1);
            $roundX3 = round($x3/1000, 1);
            $res =  array($roundX1, $roundX2, $roundX3);
            $flag = $roundX1 != $roundX2
                    && $roundX3 != $roundX2
                    && $roundX3 != $roundX1;
            if($flag)
            {
                //echo "捕捉到\n";
                return $res;
            }
        }
    }

    echo "Fail 未捕捉到\n";
    return array($x1, $x2, $x3);
}/*}}}*/

//2.产生平均数
function createParams4M($aveX)
{/*{{{*/
    $begin = 48000;
    $end = 51000;
    $m0 = $m1 = $m2 = 0;
    $rand4M1M2 = rand(450, 550);
    $m0 = rand($begin, $end);
    $m1 = $m0 + $rand4M1M2;
    $m2 = $m1 - (($m1 - $m0)*$aveX/100);
    //echo "捕捉到\n";
    return array(round($m0/1000, 4), round($m1/1000, 4), round($m2/1000, 4));

}/*}}}*/

?>