Rename the uploaded media file to post title.

Rename the Uploaded Media File to Post Title

/*-----------------------------------------------------------------------------------*/
/*	Rename the Uploaded Media File to Post Title
/*-----------------------------------------------------------------------------------*/

add_filter( 'sanitize_file_name', 'cb_sanitize_file_name' );
/**
 * @internal Missing short description
 *
 * @link wp-includes|formatting.php
 * @todo causing errors at media-new.php
 */
function cb_sanitize_file_name( $filename ) {
	global $post;
	if ( isset( $_REQUEST['post_id'] ) )
		$post_id = $_REQUEST['post_id'];
	else
		$post_id = false;
 
	// fetch the file extension
	$info = pathinfo( $filename );
	$ext  = empty( $info['extension'] ) ? '' : '.' . $info['extension'];
	 
	// get the post object
	$post_obj = get_post( $post_id );
	 
	// get the post title
	$post_title = sanitize_title( $post_obj->post_title );
	 
	// random number
	$random_number = rand( 10000, 99999 );
	 
	return $post_title . '-' . $random_number . $ext;
}