remove invalid characters from a string laravel

1function hyphenize($string) {
2    $dict = array(
3        "I'm"      => "I am",
4        "thier"    => "their",
5        // Add your own replacements here
6    );
7    return strtolower(
8        preg_replace(
9          array( '#[\\s-]+#', '#[^A-Za-z0-9. -]+#' ),
10          array( '-', '' ),
11          // the full cleanString() can be downloaded from http://www.unexpectedit.com/php/php-clean-string-of-utf8-chars-convert-to-similar-ascii-char
12          cleanString(
13              str_replace( // preg_replace can be used to support more complicated replacements
14                  array_keys($dict),
15                  array_values($dict),
16                  urldecode($string)
17              )
18          )
19        )
20    );
21}
22
23function cleanString($text) {
24    $utf8 = array(
25        '/[áàâãªä]/u'   =>   'a',
26        '/[ÁÀÂÃÄ]/u'    =>   'A',
27        '/[ÍÌÎÏ]/u'     =>   'I',
28        '/[íìîï]/u'     =>   'i',
29        '/[éèêë]/u'     =>   'e',
30        '/[ÉÈÊË]/u'     =>   'E',
31        '/[óòôõºö]/u'   =>   'o',
32        '/[ÓÒÔÕÖ]/u'    =>   'O',
33        '/[úùûü]/u'     =>   'u',
34        '/[ÚÙÛÜ]/u'     =>   'U',
35        '/ç/'           =>   'c',
36        '/Ç/'           =>   'C',
37        '/ñ/'           =>   'n',
38        '/Ñ/'           =>   'N',
39        '/–/'           =>   '-', // UTF-8 hyphen to "normal" hyphen
40        '/[’‘‹›‚]/u'    =>   ' ', // Literally a single quote
41        '/[“”«»„]/u'    =>   ' ', // Double quote
42        '/ /'           =>   ' ', // nonbreaking space (equiv. to 0x160)
43    );
44    return preg_replace(array_keys($utf8), array_values($utf8), $text);
45}
46