foreach($string as $key => $val)这是什么用法?该怎么解决

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Release: 2016-06-13 12:40:55
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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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