致命错误：未捕获错误：无法使用字符串偏移量作为数组

Question

自定义字段扩展被添加到博客插件导致此错误“致命错误：未捕获错误：无法将字符串偏移用作数组”我正在使用 PHP7 我尝试使用 array_key_exists() 但这并没有解决它意外的错误禁用扩展

public function getCustomFields()
  {
    $cfData = getXML(BLOGCUSTOMFIELDS);
    $cf = array('options' => '', 'main' => '');
    $count_options = 0;
    $count_main = 0;
    $count_opt = 0;
    foreach($cfData->item as $custom_field)
    {
      if($custom_field->area == 'options')
      {
        $cf['options'][$count_options]['key'] = (string) $custom_field->desc;
        $cf['options'][$count_options]['label'] = (string) $custom_field->label;
        $cf['options'][$count_options]['type'] = (string) $custom_field->type;
        $cf['options'][$count_options]['value'] = (string) $custom_field->value;
        if ($custom_field->type == "dropdown") 
        {
          $count_opt = 0;
          $cf['options'][$count_options]['options'] = array();
          foreach ($custom_field->option as $option) 
          {
            $cf['options'][$count_options]['options'][] = (string) $option;
            $count_opt++;
          }
        }
        $count_options++;
      }
      elseif($custom_field->area == 'main')
      {
        $cf['main'][$count_main]['key'] = (string) $custom_field->desc;
        $cf['main'][$count_main]['label'] = (string) $custom_field->label;
        $cf['main'][$count_main]['type'] = (string) $custom_field->type;
        $cf['main'][$count_main]['value'] = (string) $custom_field->value;
        if ($custom_field->type == "dropdown") 
        {
          $count_opt = 0;
          $cf['main'][$count_main]['options'] = array();
          foreach ($custom_field->option as $option) 
          {
            $cf['main'][$count_main]['options'][] = (string) $option;
            $count_opt++;
          }
        }
        $count_main++;
      }
    }
    return $cf;
  }

根据它所指的错误

$cf = array('options' => '', 'main' => '');

非常感谢您的帮助。

编辑：转储 XML 文件

object(SimpleXMLExtended)#483 (1) { ["item"]=> array(8) { [0]=> object(SimpleXMLExtended)#484 (4) { ["area"]=> string(7) "options " ["desc"]=> string(4) "slug" ["label"]=> string(8) "Slug/URL" ["type"]=> string(4) "text" } [1]= > object(SimpleXMLExtended)#485 (4) { ["area"]=> string(7) "options" ["desc"]=> string(4) "tags" ["label"]=> string(32) "标签（用逗号分隔标签）" ["type"]=> string(4) "text" } [2]=> object(SimpleXMLExtended)#486 (4) { ["area"]=> string(7) "options" ["desc"]=> string(4) "date" ["label"]=> string(25) "Publish date (any format)" ["type"]=> string(4) "text" } [3]=> object(SimpleXMLExtended)#487 (4) { ["area"]=> string(7) "options" ["desc"]=> string(8) "category" ["label"]= > string(30) "Assign this Post To A Category" ["type"]=> string(8) "dropdown" } [4]=> object(SimpleXMLExtended)#488 (4) { ["area"]=> string(7) "options" ["desc"]=> string(6) "author" ["label"]=> string(14) "Author's Name:" ["type"]=> string(4) "text " } [5]=> 对象(SimpleXMLExtended)#489 (4) { ["area"]=> string(7) "options" ["desc"]=> string(7) "private" ["label"]=> string(15) "Post is private" ["type"] => string(8) "checkbox" } [6]=> object(SimpleXMLExtended)#490 (4) { ["area"]=> string(4) "main" ["desc"]=> string(5) "title" ["label"]=> object(SimpleXMLExtended)#492 (0) { } ["type"]=> string(5) "title" } [7]=> object(SimpleXMLExtended)#491 (4) { ["area"]=> string(4) "main" ["desc"]=> string(7) "content" ["label"]=> object(SimpleXMLExtended)#493 (0) { } ["type "]=> string(8) "textarea" } } }

Answer 1

改变
$cf = array('options' => '', 'main' => '');
到
$cf = array('options' => array(), 'main' => array());

错误说

致命错误：未捕获错误：无法使用字符串偏移量作为数组

您的代码是错误的，因为您正在尝试将新键添加到 $cf['options'] 中，但它是字符串而不是数组

$cf['options'][$count_options] .....

Answer 2

从 PHP 7.1+ 版本开始，不再可能用 7.1.0 来初始化数组，在字符串上应用空索引运算符会引发致命错误。 以前，字符串被默默地转换为数组。