附件没有类别，因此in_category() 或has_category() 检查不起作用。我们需要做的是解决以下问题
获取当前附件对象。我们将利用get_queried_object() 它将保存正在查看的附件的当前post对象
确定当前附件的后父级。这很容易，从get_queried_object() 我们将利用post_parent 存储附件所属帖子ID的属性
然后我们将使用has_category() 确定附件的父级是否具有所需的类别
所有这些信息都将在attachment_template 如果附件父级属于所需类别，我们将在其中设置特定模板
您可以执行以下操作：(NOTE: 以下代码未经测试，至少需要PHP5。4）
add_filter( \'attachment_template\', function ( $template )
{
// Get the current attachment object
$attachment = get_queried_object();
// Check if current attachment\'s parent is attached to our desired category or not
if (
!has_category( // If our parent does not have this category, return
1, // Category id, or name or slug, change as needed
$attachment->post_parent // The id from the post parent
)
)
return $template;
// We have made it to here, lets set the new template for this attachment
// Check if the template exist before we add it
$locate_template = locate_template( \'image-mycategory.php\'); // Change as needed
if ( !$locate_template )
return $template;
// YEAH, everything checks out, finaly. Set the new template
return $template = $locate_template;
});
为了便于理解，我对代码进行了注释，并且还添加了您应该在哪里更改值以满足您的需要
编辑如果需要为多个类别设置相同的模板，则只需扩展in_category() 检查in_category() 接受类别ID、名称和slug的数组。像下面这样的方法会奏效
if (
!has_category( // If our parent does not have this category, return
[1, 2, 3] // Array of category id\'s, or names or slugs, change as needed
$attachment->post_parent // The id from the post parent
)
)
return $template;
如果您需要扩展此功能以为不同类别设置不同的模板，我们需要进行更多检查
add_filter( \'attachment_template\', function ( $template )
{
// Get the current attachment object
$attachment = get_queried_object();
/**
* Check if current attachment\'s parent is attached to our desired category or not and set template part
* For example, templates will be image-cars.php and image-tech.php, so our
* $parts will be cars and tech
*/
$part = \'\';
// Check for cars category and set $part
if (
has_category( // If our parent have this category, set template part
1, // Category id, or name or slug, change as needed
$attachment->post_parent // The id from the post parent
)
)
$part = \'cars\';
// Check for tech category and set $part
if (
has_category( // If our parent have this category, set template part
2, // Category id, or name or slug, change as needed
$attachment->post_parent // The id from the post parent
)
)
$part = \'tech\';
// Check if $part have a value, if not, bail
if ( !$part )
return $template;
// We have made it to here, lets set the new template for this attachment
// Check if the template exist before we add it
$locate_template = locate_template( "image-$part.php"); // Change as needed
if ( !$locate_template )
return $template;
// YEAH, everything checks out, finally. Set the new template
return $template = $locate_template;
});
