php 简单通用的日志记录方法

方法1：
// use \r\n for new line on windows, just \n on linux
function log( $logthis ){
file_put_contents('logfile.log', date("Y-m-d H:i:s"). " " . $logthis. "\r\n", FILE_APPEND | LOCK_EX);
}

方法2:
// PHP_EOL cross platform solution for new line
// // so better to use this
function log( $logthis ){
file_put_contents('logfile.log', date("Y-m-d H:i:s"). " " . $logthis.PHP_EOL, FILE_APPEND | LOCK_EX);
}