兰德函数值 [英] rand function value
问题描述
我创建用于生成随机值并与其他值连接的rand函数,并在插入此值之前通过ajax在文本字段中显示.但是在这里如何在将此值插入数据库之前检查该随机生成值是否存在于数据库中.如果该值存在,则再次生成rand函数值并再次将其连接起来.我怎样才能做到这一点?我的代码在
i create rand funtion for generating random value and concatenate with other value and show in the text field through ajax before insert this value. but here how can i check this random generating value is exists or not in database before inserting this value in database.if value is exists then again generate rand function value and again concatenate this. how can i do this? my code is below
<?php $rand=rand(100000,999999);
$roll=$branch_name.$name.$course.$year.$rand;
echo $roll;
?>
推荐答案
我知道我应该解释它的工作原理,但是在Google上确实有很多关于此的信息...
I know that i should explain how its works, but its really a big amount of information about this in google...
在下面的链接中,我附上了网址并附有一些说明:
In a link below i attached the url for it with some explain:
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