分类:PHP时间: 2015年12月18日
一般情况下PHP作为CGI运行和Apache模块运行,PHP很少在命令行(CLI)下运行。在(CLI)命令行下PHP文件中使用include、require等引入时,使用相对路径一定要先切换当前的工作目录才行,否则就会报错,找不到文件。下面看看PHP命令行(CLI)下执行相对路径问题的完美解决方法。
$cur_dir = dirname(__FILE__); //获取当前文件的目录 chdir($cur_dir); //把当前的目录改变为指定的目录。 require(../class/a.php);//引入相对路径文件
另外一个小细节,在用PHP写入文件换行时,有时使用\r\n不生效,请检查\r\n是否用的单引号,这里必须使用双引号。
这样,我们就可以在访问量小的时候用PHP做一些定时的处理,其实在Linux下和crontab定时任务配合,PHP可以帮我们做很多事。比如当天统计,数据库备份,日志清除和一些日常维护等。

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