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php字符串转换有关问题

Jun 13, 2016 pm 01:34 PM
quot rand

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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