Magento2 Framwork to deal with files/directories

To work with files in Magento2 you should follow the Framework rules, below are set of command we can use for each PHP command

class name \Magento\Framework\Filesystem\Io\File;
another class can be usefull as well 
Magento\Framework\Filesystem\Driver\File;

file_exist()        => $this->file->fileExists($file);
unlink()        => $this->file->rm($file)
mkdir()            => $this->file->mkdir($dir)
dirname()        => $this->file->dirname($file)
file_put_contents()    =>$this->file->write($filename, $src, $mode)

Magento2 Framwork to deal with files/directories

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