Home > Backend Development > PHP Tutorial > 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?

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?

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Release: 2016-06-20 12:45:29
Original
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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?


回复讨论(解决方案)

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);

array_rand()随机取出来的是键名;

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