Detailed introduction to php file processing functions (with examples)

This article brings you a detailed introduction to PHP file processing functions (with examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

PHP can easily operate directories and files, including creating, reading, modifying, deleting, etc.

mkdir

bool mkdir ( string $pathname [, int $mode = 0777 [, bool $recursive = false [, resource $context ]]] )
Try to create a new directory specified by pathname.

mkdir can create a directory specified by pathname. The default mode is 0777, which is ignored under windows and returns false on failure.

rmdir
bool rmdir ( string $dirname [, resource $context ] )
Try to delete the directory specified by dirname. The directory must be empty and must have appropriate permissions. Failure will generate an E_WARNING level error. 
As shown above, rmdir can delete the directory. It should be noted that the directory  must be empty  and must have  permissions . If it fails, false will be returned. Example 
file_put_contents
int file_put_contents ( string $filename , mixed $data [, int $flags = 0 [, resource $context ]] )
 has the same function as calling fopen(), fwrite() and fclose() in sequence. 
file_put_contents Write data into the filename file. If there is no such file, create it. If it fails, it returns false. If it succeeds, it returns the number of bytes written. Example
file_get_contents
string file_get_contents ( string $filename [, bool $use_include_path = false [, resource $context [, int $offset = -1 [, int $maxlen ]]]] )
Same as file(), except file_get_contents() reads the file into a string. The content with a length of maxlen will be read starting from the position specified by the parameter offset. 
file_get_cntents reads the content in filename and returns a string. If it fails, it returns false. Example
unlink
bool unlink ( string $filename [, resource $context ] )
Delete filename. Similar to Unix C's unlink() function. An E_WARNING level error is generated when an error occurs. 
unlink delete filename file, also need to pay attention to permissions. Example 
rename
bool rename ( string $oldname , string $newname [, resource $context ] )
Try to rename oldname to newname. 
rename can not only rename files, but also move files. If it fails, it returns false. Example
copy
bool copy ( string $source , string $dest [, resource $context ] )
Copy files from source to dest. 
As shown above, false is returned on failure. Examples
Examples and Comments
Here are a few examples that will be used at work or in interviews. 
';
    foreach (scandir($path) as $line) {
        if ($line == '.' || $line == '..') {
            continue;
        }

        if (is_dir($path . '/' . $line)) {
            getAllFiles($path . '/' . $line);
        }
        echo '
' . $path . '/' . $line . '
';
    }
    echo '';
}

/**
 * 删除目录下所有文件
 * @param $path
 */
function delAllFile($path)
{
    if (!is_dir($path)) {
        exit('目录不存在');
    }

    $dir = opendir($path);
    while ($filename = readdir($dir)) {
        if ($filename != "." && $filename != "..") {
            $file = $path . "/" . $filename;
            if (is_dir($file)) {
                delAllFile($file);
            } else {
                unlink($file);
            }
        }
    }
    closedir($dir);
    rmdir($path);
}
Note

The recursive parameter in mkdir de can create directories nested; 
the flags parameter in file_put_contents , can be combined, refer to the link for details; 
file_put_contents may also return a non-Boolean value equivalent to false, use === to judge; 
file_get_contents You can also open a URL to get web page content; 
file_get_contents If you want to open a URL with special characters (for example, spaces), you need to use urlencode( ) URL encoding; 
copy If the target file already exists, it will be overwritten; 

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