class.ilStr.php

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<?php
/*
+-----------------------------------------------------------------------------+
| ILIAS open source                                                           |
+-----------------------------------------------------------------------------+
| Copyright (c) 1998-2005 ILIAS open source, University of Cologne            |
|                                                                             |
| This program is free software; you can redistribute it and/or               |
| modify it under the terms of the GNU General Public License                 |
| as published by the Free Software Foundation; either version 2              |
| of the License, or (at your option) any later version.                      |
|                                                                             |
| This program is distributed in the hope that it will be useful,             |
| but WITHOUT ANY WARRANTY; without even the implied warranty of              |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
| GNU General Public License for more details.                                |
|                                                                             |
| You should have received a copy of the GNU General Public License           |
| along with this program; if not, write to the Free Software                 |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
+-----------------------------------------------------------------------------+
*/


class ilStr
{
        public static function subStr($a_str, $a_start, $a_length = NULL)
        {
                if (function_exists("mb_substr"))
                {
                        return mb_substr($a_str, $a_start, $a_length, "UTF-8");
                }
                else
                {
                        return substr($a_str, $a_start, $a_length);
                }
        }
        
        function strPos($a_haystack, $a_needle, $a_offset = NULL)
        {
                if (function_exists("mb_strpos"))
                {
                        return mb_strpos($a_haystack, $a_needle, $a_offset, "UTF-8");
                }
                else
                {
                        return strpos($a_haystack, $a_needle, $a_offset);
                }               
        }

        /*function strrPos($a_haystack, $a_needle, $a_offset = NULL)
        {
                if (function_exists("mb_strrpos"))
                {
                        // only for php version 5.2.0 and above
                        if( version_compare(PHP_VERSION, '5.2.0', '>=') )
                        {
                                return mb_strrpos($a_haystack, $a_needle, $a_offset, "UTF-8");
                        }
                        else
                        {
                                @todo: We need an implementation for php versions < 5.2.0
                                return mb_strrpos($a_haystack, $a_needle, "UTF-8");
                        }
                }
                else
                {
                        return strrpos($a_haystack, $a_needle, $a_offset);
                }               
        }*/
        
        public static function strLen($a_string)
        {
                if (function_exists("mb_strlen"))
                {
                        return mb_strlen($a_string, "UTF-8");
                }
                else
                {
                        return strlen($a_string);
                }               
        }

        public static function strToLower($a_string)
        {
                if (function_exists("mb_strtolower"))
                {
                        return mb_strtolower($a_string, "UTF-8");
                }
                else
                {
                        return strtolower($a_string);
                }               
        }

        function strToUpper($a_string)
        {
                $a_string = (string) $a_string;
                if (function_exists("mb_strtoupper"))
                {
                        return mb_strtoupper($a_string, "UTF-8");
                }
                else
                {
                        return strtoupper($a_string);
                }               
        }
        
        function strCmp($a, $b)
        {
                global $ilCollator;

                if (is_object($ilCollator))
                {
                        return ($ilCollator->compare(ilStr::strToUpper($a), ilStr::strToUpper($b)) > 0);
                }
                else
                {
                        return (strcoll(ilStr::strToUpper($a), ilStr::strToUpper($b)) > 0);
                }
        }
        
        public static function shortenText($a_string,$a_start_pos,$a_num_bytes,$a_encoding = 'UTF-8')
        {
                return mb_strcut($a_string, $a_start_pos, $a_num_bytes, $a_encoding);           
        }

        function isUtf8($a_str)
        {
                if (function_exists("mb_detect_encoding"))
                {
                        if (mb_detect_encoding($a_str, "UTF-8") == "UTF-8")
                        {
                                return true;
                        }
                }
                else
                {
                        // copied from http://www.php.net/manual/en/function.mb-detect-encoding.php
                        $c=0; $b=0;
                        $bits=0;
                        $len=strlen($str);
                        for($i=0; $i<$len; $i++){
                                $c=ord($str[$i]);
                                if($c > 128){
                                        if(($c >= 254)) return false;
                                        elseif($c >= 252) $bits=6;
                                        elseif($c >= 248) $bits=5;
                                        elseif($c >= 240) $bits=4;
                                        elseif($c >= 224) $bits=3;
                                        elseif($c >= 192) $bits=2;
                                        else return false;
                                        if(($i+$bits) > $len) return false;
                                        while($bits > 1){
                                                $i++;
                                                $b=ord($str[$i]);
                                                if($b < 128 || $b > 191) return false;
                                                $bits--;
                                        }
                                }
                        }
                        return true;
                }
                return false;
        }
        

} // END class.ilUtil
?>