php字符串转换有关问题
php字符串转换问题
$num="";
for($i=0;$i $num .= dechex(rand(0,15));
}
以上代码,dechex(rand(0,15)),应该得到的是数字?但是却$num .
这怎么理解。。
------解决方案--------------------
dechex的返回值是一个字符串呀

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不用数据库来实现用户的简单的下载,代码如下,但是却不能下载,请高手找下原因,文件路劲什么的没问题。
