PHP:产生不重复随机数的方法，php重复随机数方法_PHP教程

<span><?php 
$numbers = range (1,50); 
<span>//shuffle 将数组顺序随即打乱 </span>
shuffle ($numbers); 
<span>//array_slice 取该数组中的某一段 </span>
$num=6; 
$result = array_slice($numbers,0,$num); 
print_r($result); 
?></span>

<span><?php 
$numbers = range (1,20); 
<span>//播下随机数发生器种子，可有可无，测试后对结果没有影响</span>
srand ((<span>float</span>)microtime()*1000000); 
shuffle ($numbers); 
<span>//跳过list第一个值（保存的是索引）</span>
<span>while</span> (<span>list</span>(, $number) = each ($numbers)) { 
<span>echo</span> <span>"$number "</span>; 
} 
?></span>

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

<span><?php 
$tmp=<span>array</span>(); 
<span>while</span>(count($tmp)<5){ 
$tmp[]=mt_rand(1,20); 
$tmp=array_unique($tmp); 
} 
print_r($tmp);
?></span>

<span><?php 
$tmp = range(1,30);
print_r(array_rand($tmp,10));
?></span>