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[scuttle] / includes / utf8 / str_ireplace.php
1 <?php
2 /**
3 * @version $Id: str_ireplace.php,v 1.2 2007/08/12 01:20:46 harryf Exp $
4 * @package utf8
5 * @subpackage strings
6 */
7
8 //---------------------------------------------------------------
9 /**
10 * UTF-8 aware alternative to str_ireplace
11 * Case-insensitive version of str_replace
12 * Note: requires utf8_strtolower
13 * Note: it's not fast and gets slower if $search / $replace is array
14 * Notes: it's based on the assumption that the lower and uppercase
15 * versions of a UTF-8 character will have the same length in bytes
16 * which is currently true given the hash table to strtolower
17 * @param string
18 * @return string
19 * @see http://www.php.net/str_ireplace
20 * @see utf8_strtolower
21 * @package utf8
22 * @subpackage strings
23 */
24 function utf8_ireplace($search, $replace, $str, $count = NULL){
25     
26     if ( !is_array($search) ) {
27         
28         $slen = strlen($search);
29         if ( $slen == 0 ) {
30             return $str;
31         }
32         
33         $lendif = strlen($replace) - strlen($search);
34         $search = utf8_strtolower($search);
35         
36         $search = preg_quote($search);
37         $lstr = utf8_strtolower($str);
38         $i = 0;
39         $matched = 0;
40         while ( preg_match('/(.*)'.$search.'/Us',$lstr, $matches) ) {
41             if ( $i === $count ) {
42                 break;
43             }
44             $mlen = strlen($matches[0]);
45             $lstr = substr($lstr, $mlen);
46             $str = substr_replace($str, $replace, $matched+strlen($matches[1]), $slen);
47             $matched += $mlen + $lendif;
48             $i++;
49         }
50         return $str;
51         
52     } else {
53         
54         foreach ( array_keys($search) as $k ) {
55             
56             if ( is_array($replace) ) {
57                 
58                 if ( array_key_exists($k,$replace) ) {
59                     
60                     $str = utf8_ireplace($search[$k], $replace[$k], $str, $count);
61                     
62                 } else {
63                 
64                     $str = utf8_ireplace($search[$k], '', $str, $count);
65                     
66                 }
67                 
68             } else {
69             
70                 $str = utf8_ireplace($search[$k], $replace, $str, $count);
71                 
72             }
73         }
74         return $str;
75         
76     }
77
78 }
79
80

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