WordPress上传图片时自动填充图片Title和Alt属性

问题

默认情况，WordPress上传到媒体的图片title和alt为空，但是考虑到SEO，插入到文章或页面的图片必须要填写alt或者title，每张图片都要手动填写，效率太慢了。

解决

下面的代码能够实现：

// WordPress上传图片时自动填充图片Title和Alt属性
function my_set_image_meta_upon_image_upload( $post_ID ) {
  if ( wp_attachment_is_image( $post_ID ) ) {
    $my_image_title = get_post( $post_ID )->post_title;
    $my_image_title = preg_replace( '%\s*[-_\s]+\s*%', ' ',  $my_image_title );
    $my_image_title = ucwords( strtolower( $my_image_title ) );
    $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
    );
    update_post_meta( $post_ID, '_wp_attachment_image_alt', $my_image_title );
    wp_update_post( $my_image_meta );
  }
}
add_action( 'add_attachment', 'my_set_image_meta_upon_image_upload' );

WordPress上传图片时，根据图片的名字自动填充图片title和alt等属性，拿去享用吧！