sabre:遍历 TEL-属性 没有提供预期的结果

sabre: looping through TEL-property doesn´t provide what expected

一个可能很简单的问题 - 但我很笨:

sabre/vobject usage instruction 之后,我将循环 TEL-属性 以获取数字及其类型。

BEGIN:VCARD
TEL;TYPE=HOME,PREF:+15551234560
TEL;TYPE=HOME,FAX:+15551234569
TEL;TYPE=WORK:+155523456789
END:VCARD
foreach ($vCard->TEL as $number) {
    echo (string)$number . ': ' . $vCard->TEL['TYPE'] . PHP_EOL;
}

而不是

+15551234560: HOME,PREF
+15551234569: HOME,FAX
+155523456789: WORK

我收到:

+15551234560: HOME,PREF
+15551234569: HOME,PREF
+155523456789: HOME,PREF
foreach ($vCard->TEL as $number) {
    echo (string)$number . ': ' . $number['TYPE'] . PHP_EOL;
}

我找到的解决方案是:

foreach ($vCard->TEL as $key => $number) {
    echo (string)$number . ': ' . $vCard->TEL[$key]->parameters['TYPE'] . PHP_EOL;
}