This article mainly introduces the introduction to PHP file programming. It has certain reference value. Now I share it with everyone. Friends in need can refer to it

1 Get file information

1.1 The first way (fopen, fstat, file_exists)

<?php
$file_full_path = &#39;./test.txt&#39;;
if(file_exists($file_full_path)){       // 检查文件或目录是否存在，存在则返回 TRUE，否则返回 FALSE
    $fp = fopen($file_full_path, &#39;r&#39;);  // 打开文件或url，成功时返回文件指针资源，如果打开失败，本函数返回 FALSE。
    $fileinfo_arr = fstat($fp);         // 通过已打开的文件指针取得文件信息，返回一个数组具有该文件的统计信息
 
    echo &#39;<pre class="brush:php;toolbar:false">&#39;;
    var_dump($fileinfo_arr);
 
    echo &#39;文件的大小是：&#39; . $fileinfo_arr[&#39;size&#39;] . &#39;个字节&#39;;
    echo &#39;文件的创建时间是：&#39; . date(&#39;Y-m-d H:i:s&#39;, $fileinfo_arr[&#39;ctime&#39;]);
    echo &#39;文件的访问时间是：&#39; . date(&#39;Y-m-d H:i:s&#39;, $fileinfo_arr[&#39;atime&#39;]);
    echo &#39;文件的修改时间是：&#39; . date(&#39;Y-m-d H:i:s&#39;, $fileinfo_arr[&#39;mtime&#39;]);
}else{
    echo &#39;文件不存在&#39;;
}

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1.2 The second way

<?php
$file_full_path = &#39;./test.txt&#39;;
if(file_exists($file_full_path)){
    echo &#39;文件的大小是：&#39; . filesize($file_full_path);
    echo &#39;文件的类型是：&#39; . filetype($file_full_path);
 
    echo &#39;文件的创建时间是：&#39; . date(&#39;Y-m-d H:i:s&#39;, filectime($file_full_path));
    echo &#39;文件的访问时间是：&#39; . date(&#39;Y-m-d H:i:s&#39;, fileatime($file_full_path));
    echo &#39;文件的修改时间是：&#39; . date(&#39;Y-m-d H:i:s&#39;, filemtime($file_full_path));
}else{
    echo &#39;文件不存在&#39;;
}

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2 Read the file content

2.1 The first way, fread

<?php
$file_full_path = &#39;./test.txt&#39;;
if(file_exists($file_full_path)){
    // 1、打开文件
    $fp = fopen($file_full_path, &#39;r&#39;);
    // 2、获取文件的大小
    $file_size = filesize($file_full_path);
    // 3、读取内容
    $con_str = fread($fp, $file_size);      // 返回所读取的字符串， 或者在失败时返回 FALSE。
    fclose($fp);
    // 替换换行符
    $con_str = str_replace("\r\n", &#39;<br>&#39;, $con_str);
    $con_str = str_replace("\n", &#39;<br>&#39;, $con_str);
    // 替换 tab
    $con_str = str_replace("    ", "    ", $con_str);
 
    echo $con_str;
 
}else{
    echo &#39;文件不存在&#39;;
}

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2.2 The second way, feof

<?php
$file_full_path = &#39;./test.txt&#39;;
if(file_exists($file_full_path)){
    $fp = fopen($file_full_path, &#39;r&#39;);
    // 设置缓冲
    $buffer = &#39;&#39;;
    $buffer_size = 1024;
    $con_str = &#39;&#39;;
 
    while(!feof($fp)){              // 测试文件指针是否到了文件结束的位置,到达返回true，否则返回false
        $buffer = fread($fp, $buffer_size);
        $con_str .= $buffer;
    }
 
    // 关闭文件
    fclose($fp);
    $con_str = str_replace("\r\n", &#39;<br>&#39;, $con_str);
    $con_str = str_replace("\n", &#39;<br>&#39;, $con_str);
    $con_str = str_replace("    ", &#39;    &#39;, $con_str);
    echo $con_str;
}else{
    echo &#39;文件不存在&#39;;
}

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2.3 The third way, file_get_contents

<?php
$file_full_path = &#39;./test.txt&#39;;
if(file_exists($file_full_path)){
    $con_str = file_get_contents($file_full_path);      //  将整个文件读入一个字符串
 
    $con_str = str_replace("\r\n", &#39;<br>&#39;, $con_str);
    $con_str = str_replace("\n", &#39;<br>&#39;, $con_str);
    $con_str = str_replace("    ", &#39;    &#39;, $con_str);
     
    echo $con_str;
}else{
    echo &#39;文件不存在&#39;;
}

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3 Create a file and write the content

3.1 Case 1

<?php
$file_full_path = &#39;./test.txt&#39;;
if(!file_exists($file_full_path)){
    if($fp = fopen($file_full_path, &#39;w&#39;)){      // 覆盖写入10句helloworld
        $con = &#39;&#39;;
        for($i=0; $i<10; $i++){
            $con .= "HelloWorld\r\n";
        }
 
        // 写入文件
        fwrite($fp, $con);          // fwrite() 返回写入的字符数，出现错误时则返回 FALSE 。 
        fclose($fp);
    }else{
        echo &#39;创建文件失败&#39;;
    }
}else{
    echo &#39;文件已经存在&#39;;
}

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3.2 Case 2, file_put_contents

<?php
$file_full_path = &#39;./test.txt&#39;;
if(!file_exists($file_full_path)){
    $con = &#39;&#39;;
    for($i=0; $i<10; $i++){
        $con .= "helloworld\r\n";
    }
    // 默认是覆盖写，可以追加FILE_APPEND参数，改为追加写。
    file_put_contents($file_full_path, $con);       // 和依次调用 fopen()，fwrite() 以及 fclose() 功能一样。 
}else{
    echo &#39;已经存在该文件&#39;;
}

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4 Delete file

<?php
$file_full_path = &#39;./test.txt&#39;;
if(file_exists($file_full_path)){
    if(unlink($file_full_path)){
        echo &#39;<br>删除成功&#39;;
    }else{
        echo &#39;<br>删除失败&#39;;
    }
}else{
    echo &#39;文件不存在，无法删除&#39;;
}

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5 Modify file name

<?php
$file_full_path = &#39;./test.txt&#39;;
$file_new_full_path = &#39;./王八.txt&#39;;
$file_new_full_path = iconv(&#39;utf-8&#39;, &#39;gbk&#39;, $file_new_full_path);
if(file_exists($file_full_path)){
    if(rename($file_full_path, $file_new_full_path)){           // 重命名一个文件或目录
        echo &#39;改名成功！&#39;;
    }else{
        echo &#39;改名失败！&#39;;
    }
}else{
    echo &#39;文件不存在&#39;;
}

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6 Operate file directory

6.1 Create a first-level directory

<?php
$dir_full_path = &#39;./abc&#39;;
 
// 判断有没有该目录
if(!is_dir($dir_full_path)){
    if(mkdir($dir_full_path)){
        echo &#39;创建目录成功！&#39;;
    }else{
        echo &#39;创建目录失败！&#39;;
    }
}else{
    echo &#39;已经存在该目录，无法再次创建&#39;;
}

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6.2 Create a multi-level directory

<?php
$dir_full_path = &#39;./abc/edf/xyz&#39;;
if(!is_dir($dir_full_path)){
    if(mkdir($dir_full_path, 0777, true)){      // true 表示递归创建
        echo &#39;创建目录成功&#39;;
    }else{
        echo &#39;创建目录失败&#39;;
    }
}else{
    echo &#39;已经存在该目录，无法再次创建！&#39;;
}

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6.3 Delete a directory (first level)

<?php
$dir_full_path = &#39;./abc&#39;;
if(is_dir($dir_full_path)){
    if(rmdir($dir_full_path)){
        echo &#39;删除目录成功&#39;;
    }else{
        echo &#39;删除目录失败&#39;;
    }
}else{
    echo &#39;不存在该文件夹&#39;;
}

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7 Application cases of file programming

7.1 How to copy a picture

<?php
$file_src_full_path = &#39;F:/壁纸.jpg&#39;;
$file_src_full_path = iconv(&#39;utf-8&#39;, &#39;gbk&#39;, $file_src_full_path);
 
$file_des_full_path = &#39;D:/amp/WWW/萧山.jpg&#39;;
$file_des_full_path = iconv(&#39;utf-8&#39;, &#39;gbk&#39;, $file_des_full_path);
 
if(file_exists($file_src_full_path)){
    if(copy($file_src_full_path, $file_des_full_path)){
        echo &#39;拷贝成功&#39;;
    }else{
        echo &#39;拷贝失败&#39;;
    }
}else{
    echo &#39;没有这个文件&#39;;
}

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7.2 Traverse a folder and determine whether the contents under the folder are directories and files

<?php
$dir_full_path = &#39;D:/amp/WWW/&#39;;
if(is_dir($dir_full_path)){
    $dir_handle = opendir($dir_full_path);      // 如果成功则返回目录句柄的 resource，失败则返回 FALSE
    while(($file_name = readdir($dir_handle)) !== false){       // 成功则返回文件名 或者在失败时返回 FALSE 
        if(is_dir($dir_full_path . $file_name)){
            echo $file_name . &#39;是目录<br>&#39;;
        }else{
            echo $file_name . &#39;是文件<br>&#39;;
        }
    }
 
    closedir($dir_handle);
}else{
    echo &#39;不是目录，无法打开&#39;;
}

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7.3 Write a function to count the size of all files in a directory

<?php
$dir_name = &#39;D:/amp/WWW&#39;;
function getDirSize($dir_name){
    $dir_size = 0;
    $dir_handle = opendir($dir_name);
    while(($file_name = readdir($dir_handle)) !== false){
        $file = $dir_name . &#39;/&#39; . $file_name;       // 文件全名
        if($file_name!==&#39;.&#39; && $file_name!==&#39;..&#39;){
            if(is_dir($file)){
                $dir_size += getDirSize($file);
            }else{
                $dir_size += filesize($file);
            }
        }
    }
    closedir($dir_handle);
    return $dir_size;
}
 
echo getDirSize($dir_name);

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<br/>

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7.4 Delete a directory

<?php
$dir_name = &#39;D:/amp/WWW/.idea&#39;;
function rrmdir($src){
    $dir_handle = opendir($src);
    while(false !== ($file = readdir($dir_handle))){
        if(($file != &#39;.&#39;) && ($file != &#39;..&#39;)){
            $full = $src . &#39;/&#39; . $file;
            if(is_dir($full)){
                rrmdir($full);
            }else{
                unlink($full);
            }
        }
    }
    closedir($dir_handle);
    rmdir($src);
}
rrmdir($dir_name);

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The above is the entire content of this article. I hope it will be helpful to everyone’s study. For more related content, please pay attention to the PHP Chinese website!

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