php -如何修复这个非法的偏移类型错误

I'm getting "illegal offset type" error for every iteration of this code. Here's the code in case anyone can help:

我得到的“非法偏移类型”错误的每一次迭代这段代码。这里有个密码，以防有人能帮忙:

$s = array();

for($i = 0; $i < 20; $i++){

    $source = $xml->entry[$i]->source;
    $s[$source] += 1;

}

print_r($s)

Any ideas. Thanks in advance.

任何想法。提前谢谢。

5 个解决方案

#1

104

Illegal offset type errors occur when you attempt to access an array index using an object or an array as the index key.

当您试图使用对象或数组作为索引键访问数组索引时，会出现非法偏移类型错误。

Example:

例子:

$x = new stdClass();
$arr = array();
echo $arr[$x];
//illegal offset type

Your $xml array contains an object or array at $xml->entry[$i]->source for some value of $i, and when you try to use that as an index key for $s, you get that warning. You'll have to make sure $xml contains what you want it to and that you're accessing it correctly.

您的$xml数组包含一个对象或数组，其值为$xml->条目[$i]->源，值为$i，当您尝试使用它作为$s的索引键时，您会得到这个警告。您必须确保$xml包含您想要的内容，并且正确地访问它。

#2

Use trim($source) before $s[$source].

之前使用修剪(源)美元$ s[美元]来源。

#3

check $xml->entry[$i] exists and is an object before trying to get a property of it

检查$xml->条目[$i]是否存在，并且是一个对象，然后再尝试获取它的属性

 if(isset($xml->entry[$i]) && is_object($xml->entry[$i])){
   $source = $xml->entry[$i]->source;          
   $s[$source] += 1;
 }

or $source might not be a legal array offset but an array, object, resource or possibly null

或者$source可能不是一个合法的数组偏移量，而是一个数组、对象、资源或者可能是null

#4

There are probably less than 20 entries in your xml.

在xml中可能少于20个条目。

change the code to this

把代码改成这个

for ($i=0;$i< sizeof($xml->entry); $i++)
...

#5

I had a similar problem. As I got a Character from my XML child I had to convert it first to a String (or Integer, if you expect one). The following shows how I solved the problem.

我也有类似的问题。当我从XML子元素中获得一个字符时，我必须首先将它转换为一个字符串(如果您希望是整数)。下面展示了我如何解决这个问题。

foreach($xml->children() as $newInstr){
        $iInstrument = new Instrument($newInstr['id'],$newInstr->Naam,$newInstr->Key);
        $arrInstruments->offsetSet((String)$iInstrument->getID(), $iInstrument);
    }

#1

104