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<?php |
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/** |
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* User: jensk |
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* Date: 21-2-2017 |
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* Time: 10:44 |
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*/ |
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namespace library\search; |
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class CharacterFilter |
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{ |
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protected $originalString; |
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protected $filteredString = ''; |
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/** |
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* CharacterFilter constructor. |
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* |
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* @param $string |
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*/ |
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public function __construct($string) |
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{ |
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$this->originalString = $string; |
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$string = $this->convertToUTF8($string); |
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$string = mb_strtolower($string); |
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$string = $this->filterSpecialCharacters($string); |
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$this->filteredString = $string; |
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} |
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/** |
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* Returns the filtered string |
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* @return string|void |
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*/ |
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function __toString() |
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{ |
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return $this->filteredString; |
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} |
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/** |
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* Filter out all special characters, like punctuation and characters with accents |
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* |
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* @param $string |
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* |
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* @return mixed|string |
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*/ |
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private function filterSpecialCharacters($string) |
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{ |
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$string = strip_tags($string); |
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$string = iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $string); // Remove special alphanumeric characters |
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$string = str_replace(array('+', '=', '!', ',', '.',';', ':', '?'), ' ', $string); // Replace sentence breaking charaters with spaces |
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$string = preg_replace("/[\r\n]+/", " ", $string); // Replace multiple newlines with a single space. |
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$string = preg_replace("/[\t]+/", " ", $string); // Replace multiple tabs with a single space. |
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$string = preg_replace("/[^a-zA-Z0-9 ]/", '', $string); // Filter out everything that is not alphanumeric or a space |
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$string = preg_replace('!\s+!', ' ', $string); // Replace multiple spaces with a single space |
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return $string; |
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} |
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/** |
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* Convert the string to UTF-8 encoding |
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* @param $string |
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* |
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* @return string |
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*/ |
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private function convertToUTF8($string) |
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{ |
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$encoding = mb_detect_encoding($string, mb_detect_order(), false); |
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if($encoding == "UTF-8") { |
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$string = mb_convert_encoding($string, 'UTF-8', 'UTF-8'); |
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} |
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$out = iconv(mb_detect_encoding($string, mb_detect_order(), false), "UTF-8//IGNORE", $string); |
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return $out; |
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} |
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/** |
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* @return mixed|string |
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*/ |
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public function getFilteredString() |
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{ |
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return $this->filteredString; |
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} |
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} |
jenskooij /
cloudcontrol
Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.