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<?php

function slugify($text)
{
	// replace non letter or digits by -
	$text = preg_replace('~[^\pL\d]+~u', '-', $text);

	// transliterate
	$text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);

	// remove unwanted characters
	$text = preg_replace('~[^-\w]+~', '', $text);

	// trim
	$text = trim($text, '-');

	// remove duplicate -
	$text = preg_replace('~-+~', '-', $text);

	// lowercase
	$text = strtolower($text);

	if (empty($text)) {
	return 'n-a';
	}

	return $text;
}