我发现以下代码可以在每次我上传和在Wordpress中创建图像时填充ALT属性。代码获取图像的名称以填充属性，但我希望他获取标题帖子，如何修改它？我试图改变get_post( $post_ID )->post_title 到get_the_title($page->ID) 但不起作用。非常感谢！
add_action( \'add_attachment\', \'my_set_image_meta_upon_image_upload\' );
function my_set_image_meta_upon_image_upload( $post_ID ) {
// Check if uploaded file is an image, else do nothing
if ( wp_attachment_is_image( $post_ID ) ) {
$my_image_title = get_post( $post_ID )->post_title;
// Sanitize the title: remove hyphens, underscores & extra
// spaces:
$my_image_title = preg_replace( \'%\\s*[-_\\s]+\\s*%\', \' \', $my_image_title );
// Sanitize the title: capitalize first letter of every word
// (other letters lower case):
$my_image_title = ucwords( strtolower( $my_image_title ) );
// Create an array with the image meta (Title, Caption,
// Description) to be updated
// Note: comment out the Excerpt/Caption or Content/Description
// lines if not needed
$my_image_meta = array(
// Specify the image (ID) to be updated
\'ID\' => $post_ID,
// Set image Title to sanitized title
\'post_title\' => $my_image_title,
// Set image Caption (Excerpt) to sanitized title
\'post_excerpt\' => $my_image_title,
// Set image Description (Content) to sanitized title
\'post_content\' => $my_image_title,
);
// Set the image Alt-Text
update_post_meta( $post_ID, \'_wp_attachment_image_alt\', $my_image_title );
// Set the image meta (e.g. Title, Excerpt, Content)
wp_update_post( $my_image_meta );
}
}
最合适的回答,由SO网友:Krzysiek Dróżdż 整理而成
嗯，换衣服get_post( $post_ID )->post_title 到get_the_title($page->ID) 不起作用，因为变量$page 未在函数中的任何位置定义。。。
如果你看看add_attachment 钩子，然后您将看到它只需要一个参数：
$post\\U ID-（int）附件ID。
所以你没有贴子的ID。老实说，你不能有这样的帖子，因为附件可以直接上传到媒体库中，所以不会附加到任何帖子上。。。
但是add_attachment 当帖子已经在DB中时，会调用操作，因此您可以获取它的父帖子（如果附件已上载到某篇帖子，则该帖子将设置为父帖子）。
所以像这样的方法可能会奏效：
add_action( \'add_attachment\', \'my_set_image_meta_upon_image_upload\' );
function my_set_image_meta_upon_image_upload( $post_ID ) {
// Check if uploaded file is an image, else do nothing
if ( wp_attachment_is_image( $post_ID ) ) {
$attachment = get_post( $post_ID );
$my_image_title = $attachment->post_title;
if ( $attachment->post_parent ) { // if it has parent, use it\'s title instead
$my_image_title = get_post_field( \'post_title\', $attachment->post_parent );
}
... // rest of the code
wp_update_post( $my_image_meta );
}
}
