Home php教程 php手册 PHP文件打开、关闭、写入的判断与执行

PHP文件打开、关闭、写入的判断与执行

Jun 13, 2016 am 10:42 AM
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今天学习PHP的文件操作命令,涉及了fopen、fwrite、fclose、is_writable,但在使用中,很多时候可能遇到文件不存在、没有权限写入、打开失败、写入失败等各种问题,如何准确的控制和判断成了PHP中的一个“小问题”,下面是从书上摘抄下来的语句。

  

  $filename = "html/cache.txt";
  $contents = "我是张斌";
  if(is_writable($filename)){
      if(($handle = fopen($filename,"a") )== false){
         echo "写入文件 $filename 失败";
         exit();
      }
     if(fwrite($handle,$contents) == false){
        echo "写入文件$filename失败";
        exit();
      }
     echo "写入文件 $filename 成功";

     fclose($handle);
   }else{
     echo "文件$filename不可写入";
   }
?>



编程小节:注意中英文输入法的符号,特别是中文后的“;”!
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