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PHP n个不重复的随机数生成代码

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Release: 2016-06-13 12:22:44
Original
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复制代码 代码如下:


//range 是将1到100 列成一个数组
$numbers = range (1,100);
//shuffle 将数组顺序随即打乱
shuffle ($numbers);
//array_slice 取该数组中的某一段
$no=6;
$result = array_slice($numbers,0,$no);
for ($i=0;$iecho $result[$i]."
";
}
print_r($result);
?>


复制代码 代码如下:


//range 是将1到42 列成一个数组
$numbers = range (1,42);
//shuffle 将数组顺序随即打乱
shuffle ($numbers);
//array_slice 取该数组中的某一段
$result = array_slice($numbers,0,3);
print_r($result);


方法2

复制代码 代码如下:


$numbers = range (1,20);
srand ((float)microtime()*1000000);
shuffle ($numbers);
while (list (, $number) = each ($numbers)) {
echo "$number ";
}
?>

方法3
用PHP,在1-20间随机产生5个不重复的值,如何做

复制代码 代码如下:


function NoRand($begin=0,$end=20,$limit=5){
$rand_array=range($begin,$end);
shuffle($rand_array);//调用现成的数组随机排列函数
return array_slice($rand_array,0,$limit);//截取前$limit个
}
print_r(NoRand());
?>


或者不shuffle的话

复制代码 代码如下:


$tmp=array();
while(count($tmp)$tmp[]=mt_rand(1,20);
$tmp=array_unique($tmp);
}
print join(',',$tmp);
?>

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