Question

我卡住了，试图将对象数组中的特定值提取到新数组中。

当我执行以下操作时，它会按预期返回所有可用值：

<?php $speakers = array(); ?>

   <?php foreach($item->extra_fields as $fieldname): ?>  
     <?php if ($fieldname->name == 'Speaker') : ?>
         <?php $speakers[] = $fieldname->value; ?>
      <?php endif; ?>
<?php endforeach;  ?>

<pre><?php print_r($speakers); ?></pre>

当我尝试创建一个关联数组时，如下所示，该数组只有循环的最后一个值：

<?php $speakers = array(); ?>

   <?php foreach($item->extra_fields as $fieldname): ?>  
     <?php if ($fieldname->name == 'Speaker') : ?>
         <?php $speakers[$fieldname->alias] = $fieldname->value; ?>
      <?php endif; ?>

<?php endforeach;  ?>

<pre><?php print_r($speakers); ?></pre>

数组$item->extra_fields如下所示：

Array
(
    [1] => stdClass Object
        (
            [id] => 5
            [name] => Speaker
            [value] => Gudrun Timm
            [type] => textfield
            [group] => 2
            [published] => 1
            [ordering] => 2
            [alias] => name
        )

    [2] => stdClass Object
        (
            [id] => 6
            [name] => Credentials
            [value] => Founder - Link Ideas! - Germany
            [type] => textfield
            [group] => 2
            [published] => 1
            [ordering] => 3
            [alias] => credentials
        )

    [3] => stdClass Object
        (
            [id] => 7
            [name] => Presentation TItle
            [value] => My title is blablalba
            [type] => textfield
            [group] => 2
            [published] => 1
            [ordering] => 4
            [alias] => title
        )

    [5] => stdClass Object
        (
            [id] => 16
            [name] => Picture
            [value] => Picture
            [type] => image
            [group] => 2
            [published] => 1
            [ordering] => 6
            [alias] => picture
        )

    [8] => stdClass Object
        (
            [id] => 11
            [name] => Speaker
            [value] => Idar Kreutzer
            [type] => textfield
            [group] => 2
            [published] => 1
            [ordering] => 9
            [alias] => name
        )

    [9] => stdClass Object
        (
            [id] => 12
            [name] => Credentials
            [value] => CEO - Finance Norway - Norway
            [type] => textfield
            [group] => 2
            [published] => 1
            [ordering] => 10
            [alias] => credentials
        )

)

欢迎任何建议：）

以这种方式解决：

    <?php $speakers = array();

       foreach($item->extra_fields as $fieldname){  
         if ($fieldname->name == 'Speaker'){ 
           $speakers[$fieldname->name][] = $fieldname->value;
         }
       } ?>

    <pre><?php print_r($speakers); ?></pre>

Answer 1

您的代码完全按照您的说法运行。查看您正在循环的数据。您只处理数组中的name = 'Speaker'条目，其中有两个条目：键＃1和键＃8：

[1] => stdClass Object (
        [name] => Speaker
        [alias] => name
)


[8] => stdClass Object (
        [name] => Speaker
        [alias] => name
)

由于两个条目中的alias值都相同，因此您只需覆盖以前保存的条目，最后得到您遇到的最后一个条目。

Answer 2

我会这样做......

     $speakers = array();

     foreach($item->extra_fields as $fieldname)
        if ($fieldname->name == 'Speaker') : 
        $speakers[$fieldname->id] = $fieldname->value; 
     endif; 
     endforeach;

这样你就可以用我独特的方式存储它们。或者甚至可以使用这个名字？

       $speakers[$fieldname->name]= $fieldname->value;

或者，如果您需要该别名值作为键。

      $speakers[][$fieldname->alias]=$fieldname->value;

Answer 3

所有发言人＆＃39;具有相同的别名，所以它将它们全部添加到数组中，但每个连续的条目都会覆盖前一个条目，最后只留下最后一个条目。

为什么此语句只将最后一个值添加到新数组中？

3 个答案: