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PHP file and directory operations

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Release： 2023-04-02 11:58:02

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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 == &#39;.&#39; || $file == &#39;..&#39;) {               
 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;);

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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):
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 $length ] ): Read a line of text, length specifies the length of a line of text ##fclose (
resource
) : Close the file
basename ($path): Returns the file name part of the specified path Returns String
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

$path = &#39;./hello.txt&#39;;
if (!file_exists($path)) {    
$handle = fopen($path, &#39;w+&#39;);    
fwrite($handle, &#39;Hello word&#39; . &#39;\r\n&#39;);    
fclose($handle);
} else {    
$handle = fopen($path, &#39;r&#39;);    
$content = fread($handle, filesize($path));    
$content = &#39;Hello word \r\n&#39; . $content;    
fclose($handle);    
$handle = fopen($path, &#39;w&#39;);    
fwrite($handle, $content);    
fclose($handle);
}

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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 == &#39;.&#39; || $file == &#39;..&#39;) {                
continue;
            }            
            if (is_dir($path . &#39;/&#39; . $file)) 
            {
                traversal_delete_dir($path . &#39;/&#39; . $file);
            } else {                
            if (unlink($path . &#39;/&#39; . $file))
             {                    
            echo &#39;删除文件&#39; . $file . &#39;成功&#39;;
                }
            }
        }        
        closedir($handle);        
        rmdir($path);
    }
}

traversal_delete_dir(&#39;./shop_api&#39;);

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