“试图获取非对象的属性"；在PHP中 [英] "Trying to get properties on a non-object" in PHP

问题描述

我是WordPress主题开发人员，并且在我正在处理的主题上，我已打开调试模式，并在该主题的选项页面的选择下拉框中找到此错误.

I'm a WordPress theme developer and on a theme I'm working on, I've turned on debug mode and get this error inside a select drop-down box for the theme's options page.

该错误表明:试图获取非对象的属性."这是令人反感的代码:

The error says this: "Trying to get properties on a non-object." Here is the offending code:

 <select name="<?php echo $value['id']; ?>" id="<?php echo $value['id']; ?>">
                <?php foreach ($value['options'] as $option) { ?>
               <option value="<?php echo $option->term_id; ?>"  <?php if ( $settings[$id] == $option->term_id) { echo 'selected="selected"'; }?>>
                    <?php echo $option->name; ?>
                </option>                       
               <?php }?>  </select> 

我不知道自己在做什么错.专门导致该错误的行是这样的:

I can't figure out what I'm doing wrong. The line that's specifically causing the error is this:

<option value="<?php echo $option->term_id; ?>"  <?php if ( $settings[$id] == $option->term_id) { echo 'selected="selected"'; }?>>

感谢您的任何建议！ :)

Thanks for any advice! :)

推荐答案

您要这样做几次:

$option->someproperty

在至少一种情况下，$option不是对象.然后，对非对象执行->时，会出现该错误.

In at least one of the cases $option is not an object. When you then do -> on a non-object, you get that error.

首先，确认$option实际上是一个对象，如果不是，请更正用法.

First, verify that $option is actually an object and correct the usage if it is not.

如果$option是一个数组，则@matthewpavkov是正确的，您应该执行$option['someproperty']而不是$option->someproperty.

If $option is an array then @matthewpavkov is correct, you should do $option['someproperty'] instead of $option->someproperty.

如果$option通常是一个对象，则get_categories()有时会在失败的情况下返回null或false.在访问$option之前进行检查.

If $option is usually an object, perhaps get_categories() is sometimes returning null or false in a failure condition. Check for that before accessing $option.

像这样:

foreach ($value['options'] as $option)
{
    if ($option)
    {
        // do whatever;
    }
}

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