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Home > Backend Development > PHP Tutorial > 遇到怪事了 PHP 设定了range范围 但运行结果却是显示在范围之外，为什么

遇到怪事了 PHP 设定了range范围 但运行结果却是显示在范围之外，为什么

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Release： 2016-06-13 12:26:47
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碰到怪事了 PHP 设定了range范围 但运行结果却是显示在范围之外，为什么？
一段PHP随机代码，设定了range（1，30）但多次运行结果会显示出0，why？
代码：
$red1=range(1,30);
$sc1=array_rand($red1,8);
?>


foreach($sc1 as $v){
echo "$v ";
}
?>

$red2=range(1,30);
$sc1=array_rand($red2,8);
?>

foreach($sc1 as $v){
echo "$v ";
}
?>
$red1=range(1,30);
$sc1=array_rand($red1,8);
?>

foreach($sc1 as $v){
echo "$v ";
}
?>

$red2=range(1,30);
$sc1=array_rand($red2,8);
?>

foreach($sc1 as $v){
echo "$v ";
}
?>
请多刷新几次，第一个数竟然会出现0？。。为什么？


------解决思路----------------------

------解决思路----------------------
你想要的应该是打乱数组排序，取8个元素出来是吧？

shuffle($red1);
$red1 = array_splice($red1,0,8);
------解决思路----------------------
array_rand()随机取出来的是键名；
Related labels：
array nbsp range red
source：php.cn
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