PHP file and directory operations

This article mainly introduces the file and directory operations of PHP, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

php file directory operations

• Directory operation

• ##is_dir ( $path ) determines whether the current path is a directory and returns a Boolean

• opendir ( $path ) opens the path directory and returns the resource

• readdir ( $handle ) reads the next file in the currently opened directory, and at the same time Move the pointer forward one bit and return a string (file/directory name)

• closedir ( $handle ) Close the currently open directory and return a Boolean

• getcwd () Get the current working directory

• rmdir Delete the directory. Before deleting, you must first delete all files and directories in the directory

Code: List all files and file names in the specified directory

function traversal_dir($path, $deep = 0) {    
if (is_dir($path)) {        
$handle = opendir($path);        
while (($file = readdir($handle)) !== false) {            
if ($file == '.' || $file == '..') {               
 continue;
            }            
            echo str_repeat(&#39;-&#39;, 2 * $deep) . $file . &#39;</br>&#39;;            
            if (is_dir($path . &#39;/&#39; . $file)) {
                traversal_dir($path . &#39;/&#39; . $file, $deep + 1);
            }
        }
    }
}

traversal_dir(&#39;./&#39;);

• File operations

• is_file ($path): Determine whether the specified path is a file

• ##file_exists ($path): Check whether the directory or file exists

  ##fopen ($file):
Open the file or URL and return the resource
• fread (

  resource $handle , int $length ): Read the file, the length can be specified

• ##fwrite ( resource $handle , string $string [, int $length ] ): Returns the size of the written string. If length is specified, when length bytes are written or After writing string, writing will stop, depending on which situation is encountered first.

• fgets ( resource $handle [, int $length ] ): Read a line of text, length specifies the length of a line of text ##fclose (

  resource
$handle
• ) : Close the file

  basename ($path): Returns the file name part of the specified path Returns String

dirname ($path) : Returns the directory name part of the specified path Returns string
Path part
Operation part

• stat Get file information

• ##Judgment part

• #filesize ( $path ) Get the file size int

• filetype ( $path ) gets the file type string (possible values: fifo, char, dir, block, link, file and unknown)

• rename ( string $oldname

  ,
• string

  $newname [, resource $context ] ) Rename or move Return Boolean

• unlink ( $path ) 删除文件  返回布尔

• file_get_contents 将整个文件读如一个字符串

• file_put_contents 将一个字符串写入文件

　　代码：每执行一次文件，向文件头部追加 Hello word

$path = './hello.txt';
if (!file_exists($path)) {    
$handle = fopen($path, 'w+');    
fwrite($handle, 'Hello word' . '\r\n');    
fclose($handle);
} else {    
$handle = fopen($path, 'r');    
$content = fread($handle, filesize($path));    
$content = 'Hello word \r\n' . $content;    
fclose($handle);    
$handle = fopen($path, 'w');    
fwrite($handle, $content);    
fclose($handle);
}

代码：遍历删除文件夹及文件夹下所有文件

function traversal_delete_dir($path) {    
if (is_dir($path)) {        
$handle = opendir($path);        
while (($file = readdir($handle)) !== false) {            
if ($file == '.' || $file == '..') {                
continue;
            }            
            if (is_dir($path . '/' . $file)) 
            {
                traversal_delete_dir($path . '/' . $file);
            } else {                
            if (unlink($path . '/' . $file))
             {                    
            echo '删除文件' . $file . '成功';
                }
            }
        }        
        closedir($handle);        
        rmdir($path);
    }
}

traversal_delete_dir('./shop_api');

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