无法将字符串偏移量用作数组错误

Question

无法确定这里出了什么问题。请查看这里的其他人所说的内容：http://informationideas.com/news/2006/06/14/fatal-error-cannot-use-string-offset-as-an-array-in/和在php中无法将字符串偏移量用作数组。

我已经使用print_r()输出了来自Google日历的$entries实际值，它们都很好。

    foreach ( $entries as $e ) {
        $info = array(); // added to see if pre-declaration helps
        $info = array( 
                      $e[ 'title' ], 
                      $e[ 'gd:when attr' ][ 'startTime' ], 
                      $e[ 'gd:where attr' ][ 'valueString' ], 
                      $e[ 'content' ] 
                     );
     }

我做错了什么？

$entries 的转储：

Array
(
    [id] => http://www.google.com/calendar/feeds/u879een48cs77cp2rv7s05f5ps%40group.calendar.google.com/public/full/aev64a1c7kou9ige6n2mulm8mo
    [published] => 2009-12-31T15:34:47.000Z
    [updated] => 2009-12-31T15:34:58.000Z
    [category attr] => Array
        (
            [scheme] => http://schemas.google.com/g/2005#kind
            [term] => http://schemas.google.com/g/2005#event
        )

    [category] => 
    [title attr] => Array
        (
            [type] => text
        )

    [title] => Happy New Year!
    [content attr] => Array
        (
            [type] => text
        )

    [content] => 
    [link] => Array
        (
            [0 attr] => Array
                (
                    [rel] => alternate
                    [type] => text/html
                    [href] => http://www.google.com/calendar/event?eid=YWV2NjRhMWM3a291OWlnZTZuMm11bG04bW8gdTg3OWVlbjQ4Y3M3N2NwMnJ2N3MwNWY1cHNAZw
                    [title] => alternate
                )

            [0] => 
            [1 attr] => Array
                (
                    [rel] => self
                    [type] => application/atom+xml
                    [href] => http://www.google.com/calendar/feeds/u879een48cs77cp2rv7s05f5ps%40group.calendar.google.com/public/full/aev64a1c7kou9ige6n2mulm8mo
                )

            [1] => 
        )

    [author] => Array
        (
            [name] => New Orleans Parents Guide to Public Schools
        )

    [gd:comments] => Array
        (
            [gd:feedLink attr] => Array
                (
                    [href] => http://www.google.com/calendar/feeds/u879een48cs77cp2rv7s05f5ps%40group.calendar.google.com/public/full/aev64a1c7kou9ige6n2mulm8mo/comments
                )

            [gd:feedLink] => 
        )

    [gd:eventStatus attr] => Array
        (
            [value] => http://schemas.google.com/g/2005#event.confirmed
        )

    [gd:eventStatus] => 
    [gd:where attr] => Array
        (
            [valueString] => 
        )

    [gd:where] => 
    [gd:who attr] => Array
        (
            [email] => [e-mail]
            [rel] => http://schemas.google.com/g/2005#event.organizer
            [valueString] => New Orleans Parents Guide to Public Schools
        )

    [gd:who] => 
    [gd:when attr] => Array
        (
            [endTime] => 2010-01-01
            [startTime] => 2009-12-31
        )

    [gd:when] => 
    [gd:transparency attr] => Array
        (
            [value] => http://schemas.google.com/g/2005#event.opaque
        )

    [gd:transparency] => 
    [gCal:anyoneCanAddSelf attr] => Array
        (
            [value] => false
        )

    [gCal:anyoneCanAddSelf] => 
    [gCal:guestsCanInviteOthers attr] => Array
        (
            [value] => true
        )

    [gCal:guestsCanInviteOthers] => 
    [gCal:guestsCanModify attr] => Array
        (
            [value] => false
        )

    [gCal:guestsCanModify] => 
    [gCal:guestsCanSeeGuests attr] => Array
        (
            [value] => true
        )

    [gCal:guestsCanSeeGuests] => 
    [gCal:sequence attr] => Array
        (
            [value] => 2
        )

    [gCal:sequence] => 
    [gCal:uid attr] => Array
        (
            [value] => [e-mail]
        )

    [gCal:uid] => 
)

- jerrygarciuh

---

你能发布一下entries中print_r值的结果吗？这样我们就可以知道entires的结构是什么。 - Daniel Bingham

你能展示一下 print_r($entries); 打印出来的内容吗？ - antpaw

编辑以添加$entries的转储; 谢谢！ - jerrygarciuh

哈哈，我赢了我的赌注！我什么时候能得到我的啤酒？ :) - Pekka

说真的，这只是一个日历条目。如果你在它上面运行foreach，你会得到所有数组成员。我认为你实际想要的是遍历多个这样的条目。然后你的代码就能正常工作了。 - Pekka

嗨，Pekka，随时来新奥尔良，我会请你喝啤酒！顺便说一下，代码确实会迭代许多条目。那个循环在我的片段之外。整个东西现在运行得非常好！谢谢！ - jerrygarciuh

Answer 1

我打赌要么

• $entries不是一个数组
• 一个或多个$e不是数组

尝试一下

foreach ( $entries as $e ) {
    $info = array(); // added to see if pre-declaration helps
    if (is_array($e)) // only go on if $e is actually an array
    $info = array( $e[ 'title' ], 
                   $e[ 'gd:when attr' ][ 'startTime' ], 
                   $e[ 'gd:where attr' ][ 'valueString' ], 
                   $e[ 'content' ] );
}

如果你想做得非常规范，你需要先使用 isset() 或者 array_key_exists() 检查 $e 的每个键（比如 "startTime" 等）。

- Pekka

---

谢谢Pekka！这不仅解决了问题，还揭示了我在错误假设下操作代码时的其他问题。非常感激。 - jerrygarciuh

Answer 2

你不需要使用foreach

$info = array( 
                  $entries[ 'title' ], 
                  $entries[ 'gd:when attr' ][ 'startTime' ], 
                  $entries[ 'gd:where attr' ][ 'valueString' ], 
                  $entries[ 'content' ] 
                 );

- antpaw

---

如果日历恰好有多个条目，我不需要它吗？ - jerrygarciuh

Answer 3

要克服此错误，首先检查它是一个数组还是网络，然后进行数组元素操作。

- Debangshu