Fallback.php

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<?php
class Fallback {

        public static function iconv( $from, $to, $string ) {
                if ( substr( $to, -8 ) == '//IGNORE' ) {
                        $to = substr( $to, 0, strlen( $to ) - 8 );
                }
                if( strcasecmp( $from, $to ) == 0 ) {
                        return $string;
                }
                if( strcasecmp( $from, 'utf-8' ) == 0 ) {
                        return utf8_decode( $string );
                }
                if( strcasecmp( $to, 'utf-8' ) == 0 ) {
                        return utf8_encode( $string );
                }
                return $string;
        }

        public static function mb_substr( $str, $start, $count = 'end' ) {
                if( $start != 0 ) {
                        $split = self::mb_substr_split_unicode( $str, intval( $start ) );
                        $str = substr( $str, $split );
                }

                if( $count !== 'end' ) {
                        $split = self::mb_substr_split_unicode( $str, intval( $count ) );
                        $str = substr( $str, 0, $split );
                }

                return $str;
        }

        public static function mb_substr_split_unicode( $str, $splitPos ) {
                if( $splitPos == 0 ) {
                        return 0;
                }

                $byteLen = strlen( $str );

                if( $splitPos > 0 ) {
                        if( $splitPos > 256 ) {
                                // Optimize large string offsets by skipping ahead N bytes.
                                // This will cut out most of our slow time on Latin-based text,
                                // and 1/2 to 1/3 on East European and Asian scripts.
                                $bytePos = $splitPos;
                                while ( $bytePos < $byteLen && $str[$bytePos] >= "\x80" && $str[$bytePos] < "\xc0" ) {
                                        ++$bytePos;
                                }
                                $charPos = mb_strlen( substr( $str, 0, $bytePos ) );
                        } else {
                                $charPos = 0;
                                $bytePos = 0;
                        }

                        while( $charPos++ < $splitPos ) {
                                ++$bytePos;
                                // Move past any tail bytes
                                while ( $bytePos < $byteLen && $str[$bytePos] >= "\x80" && $str[$bytePos] < "\xc0" ) {
                                        ++$bytePos;
                                }
                        }
                } else {
                        $splitPosX = $splitPos + 1;
                        $charPos = 0; // relative to end of string; we don't care about the actual char position here
                        $bytePos = $byteLen;
                        while( $bytePos > 0 && $charPos-- >= $splitPosX ) {
                                --$bytePos;
                                // Move past any tail bytes
                                while ( $bytePos > 0 && $str[$bytePos] >= "\x80" && $str[$bytePos] < "\xc0" ) {
                                        --$bytePos;
                                }
                        }
                }

                return $bytePos;
        }

        public static function mb_strlen( $str, $enc = '' ) {
                $counts = count_chars( $str );
                $total = 0;

                // Count ASCII bytes
                for( $i = 0; $i < 0x80; $i++ ) {
                        $total += $counts[$i];
                }

                // Count multibyte sequence heads
                for( $i = 0xc0; $i < 0xff; $i++ ) {
                        $total += $counts[$i];
                }
                return $total;
        }

        public static function mb_strpos( $haystack, $needle, $offset = 0, $encoding = '' ) {
                $needle = preg_quote( $needle, '/' );

                $ar = array();
                preg_match( '/' . $needle . '/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );

                if( isset( $ar[0][1] ) ) {
                        return $ar[0][1];
                } else {
                        return false;
                }
        }

        public static function mb_strrpos( $haystack, $needle, $offset = 0, $encoding = '' ) {
                $needle = preg_quote( $needle, '/' );

                $ar = array();
                preg_match_all( '/' . $needle . '/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );

                if( isset( $ar[0] ) && count( $ar[0] ) > 0 &&
                        isset( $ar[0][count( $ar[0] ) - 1][1] ) ) {
                        return $ar[0][count( $ar[0] ) - 1][1];
                } else {
                        return false;
                }
        }
}