<?php
/**
 功能：檔案避免中文檔名
 **/
function achang_chang_filename_to_date($filename) {
	$info = pathinfo($filename);
	$ext  = empty($info['extension']) ? '' : '.' . $info['extension'];
	$name = basename($filename, $ext);
	if(!is_numeric($name)){

		$time = date_i18n( 'Y-m-d-His-', false,false );
		$new_filename = $time .mt_rand(1,100);

	}else{
		$new_filename = $name;
	}
    return  $new_filename . $ext;
}
add_filter('sanitize_file_name', 'achang_chang_filename_to_date', 10);