Question

如果我仅在第一次循环访问foreach循环时进入if并获取变量值，那么每次下载时它仍然具有旧值。为什么呢？

如果我print_r($i)并杀了它就会响应： A0A0A0A0A0A0A0A0A0A0A0A0A0A0TXTTXT16

实际金额是它的结尾（16）。这意味着它循环循环16次，但只进入if $type更改的第一个循环。因此$type每次循环时都不会获得新值。

我的代码：

    $recordTypes = array('CnameRecord', 'ARecord', 'MxRecord', 'TxtRecord');
    foreach ($recordTypes as $type) {
        $modelName = $type::model()->tableName();
        $record = $type::model()->findAllbySql("SELECT * FROM $modelName WHERE vhost_id LIKE $id");
        if ($record) {
            foreach ($record as $key=>$rec) {
                if ($type == 'ARecord'){
                    $type = 'A' + $i;
                    $hostname = $rec['sub_vhost_name'];
                    $points_to = $rec['points_to'];
                    $ttl = $rec['ttl'];
                } else if ($type == 'CnameRecord') {
                    $type = 'CNAME';
                    $hostname = $rec['hostname'];
                    $points_to = $rec['points_to'];
                    $ttl = $rec['ttl'];
                } else if ($type == 'MxRecord') {
                    $type = 'MX';
                    $priority = $rec['priority'] . '    ';
                    $points_to = $rec['points_to'];
                    $ttl = $rec['ttl'];
                    $hostname = $rec['host'];
                } else if ($type == 'TxtRecord') {
                    $type = 'TXT';
                    $hostname = $rec['hostname'];
                    $points_to = '"' . $rec['txt_value'] . '"   ';
                    $ttl = $rec['ttl'];
                }
                $i++;
                print_r($type);
                $custom_content = $hostname . ' ' . $ttl . '    ' . 'IN' . '    ' . $type . '   ' . $priority . $points_to . "\n";
            }
        }
    }
print_r($i);die;

Answer 1

你正在使用：

foreach ($recordTypes as $type) { ...

在foreach中你正在修改“type”var，所以在通过$ record的下一个循环中，你将失败任何if语句。将$ type var（if语句内部）更改为另一个var名称，然后重试。

为什么foreach只在第一次循环时进入？

1 个答案: