Dutch license plates

dutch-license-plates.php

function license($string, $validate = false)
{
	$licenses = [
		'specials' => [
			'koninklijk' => '~^AA(\d{2})$~',
			'buitenlands' => '~^(B|G)N\d{4}$~',
			'diplomatiek' => '~^CD[ABFJNST](\d{1,3})$~',
			'NAVO' => '~^RC(\d{4})$~',
			'militair' => '~^(DF|(\d{2})?(K(A|L-Z)|L(M|O|U)|MC|DM))~',
			'landbouw' => '~^GV~',
			'speciaal' => '~^ZZ~',
		],
		'regulars' => [
			'~^([A-z]{2})(\d{2})(\d{2})$~', // AB-12-34
			'~^(\d{2})(\d{2})([A-z]{2})$~', // 12-34-AB
			'~^(\d{2})([A-z]{2})(\d{2})$~', // 12-AB-34
			'~^([A-z]{2})(\d{2})([A-z]{2})$~', // AB-12-CD
			'~^([A-z]{2})([A-z]{2})(\d{2})$~', // AB-CD-12
			'~^(\d{2})([A-z]{2})([A-z]{2})$~', // 12-AB-CD
			'~^(\d{2})([A-z]{3})(\d{1})$~', // 12-ABC-3
			'~^(\d{1})([A-z]{3})(\d{2})$~', // 1-ABC-23
			'~^([A-z]{2})(\d{3})([A-z]{1})$~', // AB-123-C
			'~^([A-z]{1})(\d{3})([A-z]{2})$~', // A-123-BC
			'~^([A-z]{3})(\d{2})([A-z]{1})$~', // ABC-12-D
			'~^([A-z]{1})(\d{2})([A-z]{3})$~', // A-12-BCD
			'~^(\d{1})([A-z]{2})(\d{3})$~', // 1-AB-234
			'~^(\d{3})([A-z]{2})(\d{1})$~', // 123-AB-4
			'~^(\d{3})(\d{2})([A-z]{1})$~', // 123-45-A
			'~^([A-z]{3})(\d{2})(\d{1})$~', // ABC-12-3
			'~^([A-z]{3})([A-z]{2})(\d{1})$~', // ABC-DE-1
		]
	];
	if(is_string($string))
	{
		$string = strtoupper(str_replace(['-', ' '], '', $string));
		foreach($licenses['specials'] as $key => $special)
		{
			if(preg_match($special, $string))
			{
				return ($validate ? true : ucfirst($key));
			}
		}
		if(strlen($string) === 6)
		{
			foreach($licenses['regulars'] as $key => $regular)
			{
				if(preg_match($regular, $string))
				{
					return ($validate ? true : preg_replace($regular, '$1-$2-$3', $string));
				}
			}
		}
	}
	return false;
}