Automatically add ALT tags to images uploaded to Wordpress media library based off of the file name.

WordPress function to automatically add ALT tags to images on upload

// WordPress function to automatically 
// add ALT tags to images on upload.

function alt_tag_adder( $post_ID ) {
  if ( wp_attachment_is_image( $post_ID ) ) {
    $tc_title = get_post( $post_ID )->post_title;
    $tc_title = preg_replace( '%\s*[-_\s]+\s*%', ' ',  $tc_title );
    $tc_title = ucwords( strtolower( $tc_title ) );
    $tc_meta = array(
      'ID'  =>  $post_ID,
    );
    update_post_meta( $post_ID, '_wp_attachment_image_alt', $tc_title );
    wp_update_post( $tc_meta );
  }
}

add_action( 'add_attachment', 'alt_tag_adder' );