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PHP N个不重复的随机数生成代码 - 站长搜索
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PHP N个不重复的随机数生成代码

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2014-12-10 16:12:04 转载来源: 网络整理/侵权必删

本文是三个php实现的可以生成N个不重复的随机数生成代码示例,感兴趣的同学参考下. PHP n个不重复的随机数生成代码,原理就是将数组顺序随即打乱 ,然取该数组中的某一段 <?php //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;$i<$no;$i++){ echo $result[$i]

本文是三个php实现的可以生成N个不重复随机数生成代码示例,感兴趣的同学参考下.

PHP n个不重复的随机数生成代码,原理就是将数组顺序随即打乱 ,然取该数组中的某一段


<?php
//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;$i<$no;$i++){
echo $result[$i]."<br>";
}
print_r($result);
?>

//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

 

 


<?php
$numbers = range (1,20);
srand ((float)microtime()*1000000);
shuffle ($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

 

 

<?php
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

 


<?php
$tmp=array();
while(count($tmp)<5){
$tmp[]=mt_rand(1,20);
$tmp=array_unique($tmp);
}
print join(',',$tmp);
?>

 


标签: PHP 个不 重复 随机数 生成 代码


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