<？PHP mkdir(“testing”); ？> < =这样,实际上创建了一个名为“testing”的文件夹.
> mkdir () function on PHP.net

基本文件创建

<?PHP
$file = fopen("test.txt","w");
echo fwrite($file,"Hello World. Testing!");
fclose($file);
?>

使用a或开关添加/追加到文件.

> fwrite() function on PHP.net

编辑：

此版本将同时创建一个文件和文件夹,并在屏幕上显示.

<?PHP

// change the name below for the folder you want
$dir = "new_folder_name";

$file_to_write = 'test.txt';
$content_to_write = "The content";

if( is_dir($dir) === false )
{
    mkdir($dir);
}

$file = fopen($dir . '/' . $file_to_write,"w");

// a different way to write content into
// fwrite($file,"Hello World.");

fwrite($file,$content_to_write);

// closes the file
fclose($file);

// this will show the created file from the created folder on screen
include $dir . '/' . $file_to_write;

?>