WordPress上传图片自动添加Alt和图像描述

WordPress上传图片时手动给图片添加替代文本（Alt）和图像描述有些麻烦，可以通过本文的方法自动将图片名称设置为WordPress图像标题、说明和图像描述，如图：

将下面的代码添加到当前主题函数模板functions.php中：

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(
'ID' => $post_ID,
// Specify the image (ID) to be updated
'post_title' => $my_image_title,
// Set image Title to sanitized title
'post_excerpt' => $my_image_title,
// Set image Caption (Excerpt) to sanitized title
'post_content' => $my_image_title,
// Set image Description (Content) to sanitized 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 ); } }

代码可以过滤掉图片名称中的空格等多余元素，对之前上传的图片无效。