Create folder php

// Create folder if not exist
		$folderName = 'images/gallery';
		$config['upload_path'] = $folderName;
		if(!is_dir($folderName))
		{
			mkdir($folderName, 0777);
		}

Php mkdir

// Create a directory with the permission level (optional)
<?php
mkdir("/path/to/my/dir", 0700);
?>

Source: php.net

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