SlugHelper.php

<?php
namespace moonland\helpers;

use yii\helpers\ArrayHelper;

use yii\base\Object;

function seems_utf8($str) {
	$length = strlen($str);
	for ($i=0; $i < $length; $i++) {
		$c = ord($str[$i]);
		if ($c < 0x80) $n = 0; # 0bbbbbbb
		elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb
		elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb
		elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb
		elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb
		elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b
		else return false; # Does not match any model
		for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?
			if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))
			return false;
		}
	}
	return true;
}

function utf8_uri_encode( $utf8_string, $length = 0 ) {
	$unicode = '';
	$values = array();
	$num_octets = 1;
	$unicode_length = 0;

	$string_length = strlen( $utf8_string );
	for ($i = 0; $i < $string_length; $i++ ) {

		$value = ord( $utf8_string[ $i ] );

		if ( $value < 128 ) {
			if ( $length && ( $unicode_length >= $length ) )
				break;
			$unicode .= chr($value);
			$unicode_length++;
		} else {
			if ( count( $values ) == 0 ) $num_octets = ( $value < 224 ) ? 2 : 3;

			$values[] = $value;

			if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )
				break;
			if ( count( $values ) == $num_octets ) {
				if ($num_octets == 3) {
					$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]) . '%' . dechex($values[2]);
					$unicode_length += 9;
				} else {
					$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]);
					$unicode_length += 6;
				}

				$values = array();
				$num_octets = 1;
			}
		}
	}

	return $unicode;
}

/**
 * Slug Helper class file.
 * @author Moh Khoirul Anam <moh.khoirul.anaam@gmail.com>
 * @copyright 2015
 * @since 1
 */
class SlugHelper extends Object
{
	/**
	 * Static Generate the slug
	 * @param string $text to create the slug
	 * @return string
	 */
	public static function generate($text) {
		return static::sanitize_title($text);
	}
	
	public static function sanitize_title($title) {
		$title = strip_tags($title);
		// Preserve escaped octets.
		$title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
		// Remove percent signs that are not part of an octet.
		$title = str_replace('%', '', $title);
		// Restore octets.
		$title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);

		if (seems_utf8($title)) {
			if (function_exists('mb_strtolower')) {
				$title = mb_strtolower($title, 'UTF-8');
			}
			$title = utf8_uri_encode($title, 200);
		}

		$title = strtolower($title);
		$title = preg_replace('/&.+?;/', '', $title); // kill entities
		$title = str_replace('.', '-', $title);
		$title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
		$title = preg_replace('/\s+/', '-', $title);
		$title = preg_replace('|-+|', '-', $title);
		$title = trim($title, '-');

		return $title;
	}

	public static function is_serialized( $data ) {
		// if it isn't a string, it isn't serialized
		if ( !is_string( $data ) )
			return false;
		$data = trim( $data );
		if ( 'N;' == $data )
			return true;
		if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
			return false;
		switch ( $badions[1] ) {
			case 'a' :
			case 'O' :
			case 's' :
				if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
					return true;
				break;
			case 'b' :
			case 'i' :
			case 'd' :
				if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
					return true;
				break;
		}
		return false;
	}

	public static function maybe_unserialize( $original ) {
		if ( self::is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
			return @unserialize( $original );
		return $original;
	}

}