Hi Hans Goutier.
Please did not add the above code because this code has some errors. So please add the below code for your work.
/* Automatically set the image Title, Alt-Text, Caption & Description upon upload
———————————————————————–*/
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 );
}
}
Let us know if it works.
Thanks