PHP数组引用的异常行为 [英] Unexpected behaviour with PHP array references

问题描述

我正在使用引用来更改数组:

I'm using references to alter an array:

foreach($uNewAppointments as &$newAppointment)
{
    foreach($appointments as &$appointment)
    {
        if($appointment == $newAppointment){
            $appointment['index'] = $counter;
        }
    }
    $newAppointment['index'] = $counter;
    $newAppointments[$counter] = $newAppointment;

    $counter++;
}

如果我打印数组内容，那么我会收到预期的结果.当我对其进行迭代时，所有元素似乎都是相同的(第一个).

If I print the array contents, then I receive the expected result. When I iterate over it, all elements seem to be the same (the first).

当我删除内部数组中的引用运算符& 时，一切正常，除了未设置索引.

When I remove the reference operator & in the inner array, all goes normal, except index isn't set.

推荐答案

如果执行此操作，则退出循环时必须取消设置$ newAppointment.这是相关条目.

If you do this, you must unset $newAppointment when you exit the loop. Here is the relevant entry.

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