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下面这段怎么理解

WBOY
WBOYOriginal
2016-06-23 13:45:15877browse

$str="1234567890";
$s='';

for($i=0;$i {
    $k=mt_rand(1, strlen($str));
    $s.=$str[$k-1];
}

我也知道是循环随机数,但是为啥一次出来的是四个呢


回复讨论(解决方案)

for 循环里面不是有条件 $i

for($i=0;$i {
    $k=mt_rand(1, strlen($str));
    $s.=$str[$k-1];
}

循环了4次,当然是一次4个了。很正常啊。

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