Create Files Programmatically In Magento 2

$url = "https://webkul.com/wp-content/themes/webkul/inc/E-Commerce-Marketplace-Use-Case.pdf";
$pdfContent = file_get_contents($url);

• file_get_contents(_path) : In php this is best and preferred way to read complete file into string
  • Parameters:
    • _path : File path which need to read.
    • offset : Specify position from where file reading starts.
    • maxlen : Define length of data which need to read. By default it read complete data. 

$filePath = "/webkul/attachment/file/pdf/";
$pdfPath = $this->_directoryList->getPath('media').$filePath;
if (!is_dir($pdfPath)) {
$ioAdapter = $this->_file;
$ioAdapter->mkdir($pdfPath, 0775);
}

• _directoryList : Is an object of “Magento\Framework\App\Filesystem\DirectoryList” class.
• getPath(directory_type) : It returns path of desired directory type.
• is_dir(directory_path) : Check for directory and return True if directory exist.
• _file : Is an object of “Magento\Framework\Filesystem\Io\File” class.
• mkdir(directory_path,  directory_permission) : Create directory of given path,
  • Parameters:
    • directory_path : Path of directory (“/webkul/attachment/file/pdf“)
    • directory_permission : File permission as per as requirement (0644).

$fileName = "webkul.pdf";
$ioAdapter->open(array('path'=>$pdfPath));
$ioAdapter->write($fileName, $pdfContent, 0666);

• open : Helps to open given path where file need to create.
• write(_fileName, _fileContent, _filePermission) :  Create file inside given path.
  • Parameters :
    • _filename : Specify file name
    • _filecontent : Content of file which need to create
    • _filePermission : Permission of file which need to assign as per as requirement.