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