foreach($string as $key => $val)这是什么用法？
if(is_array($string)) { //如果其为一个数组则循环执行此函数
foreach($string as $key => $val) {
$string[$key] = daddslashes($val, $force);
}
看discuz的代码分析文章，在daddslashes函数中看到了这个，遍历数组，给key赋值？可是我这样写的话，就一直报错，为什么呢？
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