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php文件操作函数详解

Jun 13, 2016 am 11:15 AM
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在php中提供了大量的对文件操作的函数,下面我来给大家总结php 文件函数对文件读入,写入操作,有需了解的这些函数的朋友可进入参考。  

一、操作文件,获取文件信息

 代码如下 复制代码

    //打开文件
    $file_path="text.txt";
    if($fp=fopen($file_path,"r")){
        //取出文件的信息
        $file_info=fstat($fp);
        echo "

	";
        print_r($file_info);
        echo "
Copy after login
";

 

        //单个的取出
        $file_size=$file_info['size'];
        //文件大小按字节来计算的
        echo "文件的大小为:".$file_size;
        echo  "
文件上次访问的时间:".date("Y-m-d H:i:s",$file_info['atime']);  //atime表示【该文件上次被访问的时间】
        echo  "
文件上次修改的时间:".date("Y-m-d H:i:s",$file_info['mtime']);  //mtime表示【该文件上次内容被修改的时间】
        echo  "
文件上次change的时间:".date("Y-m-d H:i:s",$file_info['ctime']); //ctime表示【该文件上次 文件所有者/文件组 修改的时间】

    }else{
        echo "打开文件失败";
    }
   
    //关闭文件,这个非常重要
    fclose($fp);
?>

2、第二种获取文件信息方式

 代码如下 复制代码

    //第二种获取文件信息
    $file_path="text.txt";
    if(!file_exists($file_path)){
        echo "文件不存在";
        exit();
    }

    echo "
".date("Y-m-d H:i:s",fileatime($file_path));
    echo "
".date("Y-m-d H:i:s",filemtime($file_path));
    echo "
".date("Y-m-d H:i:s",filectime($file_path));

    //echo "
".filemtime($file_path);
    //echo "
".filectime($file_path);
?>

二、读取文件操作

 代码如下 复制代码

    //读取文件
    $file_path="text.txt";

    if(!file_exists($file_path)){
        echo "文件不存在";
        exit();
    }
   
    //打开文件
    $fp=fopen($file_path,"a+");
    //读取文件
    $content=fread($fp,filesize($file_path));
    echo "文件内容是:
";
    //默认情况下把内容输出到网页后,不会换行显示,因为网页不识别rn
    //所有要把rn =>

   
    $content=str_replace("rn","
",$content);
    echo  $content;

    fclose($fp);
?>


 

2、第二种读取文件的方式

 代码如下 复制代码


    //第二种读取文件的方式

    $file_path="text.txt";
    if(!file_exists($file_path)){
        echo "文件不存在";
        exit();
    }
    $content=file_get_contents($file_path);

    $content=str_replace("rn","
",$content);
    echo  $content;
?>


 

3、第三种读取方法,循环读取(对付大文件)

 代码如下 复制代码


    //第三种读取方法,循环读取(对付大文件)

    $file_path="text.txt";
    if(!file_exists($file_path)){
        echo "文件不存在";
        exit();
    }

    //打开文件
    $fp=fopen($file_path,"a+");
    //定义每次读取的多少字节
    $buffer=1024;
    //一边读取。一边判断是否达到文件末尾
    while(!feof($fp)){
        //按1024个字节读取数据
        $content=fread($fp,$buffer);
        echo $content;
    }

    fclose($fp);
?>


 

4、文件读取实际应用:当我们连接数据库的时候,可以把指定的数据配置到一个文件中,然后再PHP运行时,实时获取信息

 代码如下 复制代码

db.ini 文件

host=127.0.0.1
user=root
pwd=root
db=test


获取文件

 代码如下 复制代码

    $arr=parse_ini_file("db.ini");
    echo "

	";
    print_r($arr);
    echo "
Copy after login
";
   
    echo $arr['host'];

 

    //连接数据库
    $conn = mysql_connect($arr['host'], $arr['user'], $arr['pwd']);

    if(!$conn){
        echo "error";
    }

    echo "OK";
?>

三、写文件

 代码如下 复制代码

    //写文件
    $file_path="text.txt";
    if(!file_exists($file_path)){
        echo "文件不存在";
        exit();
    }
    //"a+" 在文件后面追加  "w+"重新写入

    $fp=fopen($file_path,"w+");
    $con="rn你好";
    for($i=0;$i     fwrite($fp,$con);}

    echo "添加成功";
    fclose($fp);

   
?>

2、第二中方式  通过file_put_contents函数

 代码如下 复制代码


    //第二种方式写文件
    $file_path="text.txt";
    $content="hello,worldrn";

    //将一个字符串写入文件  默认是【FILE_USE_INCLUDE_PATH 】"w+"重新写入
    file_put_contents($file_path,$content,FILE_APPEND);

    echo "OK";
?>


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