PHP byte array and string conversion class

<?PHP/** * byte array and string conversion class * @author ZT*/classBytes {/** * Convert a string string to a byte array * @param $str the string to be converted * @param $bytes destination byte array*/     Public Static functionGetBytes$str) {        $len=strlen($str); $bytes=Array();  for($i= 0;$i<$len;$i++) {            if(Ord($str[$i]) >= 128){                $byte=Ord($str[$i])-256; }Else{                $byte=Ord($str[$i]); }            $bytes[] =$byte ; }        return $bytes; }         /** * Convert byte arrays to data of type String * @param $bytes byte array * @param $str target String * @return A String type of data*/     Public Static functionTOSTR ($bytes) {        $str= ' '; foreach($bytes  as $ch) {            $str.=CHR($ch); }        return $str; }         /** convert an int to a byte array * @param $byt destination byte array * @param $val the string to be converted*/          Public Static functionIntegertobytes ($val) {        $byt=Array(); $byt[0] = ($val& 0xFF); $byt[1] = ($val>> 8 & 0xFF); $byt[2] = ($val>> & 0xFF); $byt[3] = ($val>> & 0xFF); return $byt; }         /** * Reads an integer type of data from the location specified in the byte array * @param $bytes byte array * @param $position the specified start position * @return An integer type of Data*/     Public Static functionBytestointeger ($bytes,$position) {        $val= 0; $val=$bytes[$position+ 3] & 0xFF; $val<<= 8; $val|=$bytes[$position+ 2] & 0xFF; $val<<= 8; $val|=$bytes[$position+ 1] & 0xFF; $val<<= 8; $val|=$bytes[$position] & 0xFF; return $val; }    /** * Convert a Shor string to a byte array * @param $byt destination byte array * @param $val string to convert*/          Public Static functionShorttobytes ($val) {        $byt=Array(); $byt[0] = ($val& 0xFF); $byt[1] = ($val>> 8 & 0xFF); return $byt; }         /** * Reads a short type of data from the location specified in the byte array. * @param $bytes byte array * @param $position specified start position * @return A short type of data*/     Public Static functionBytestoshort ($bytes,$position) {        $val= 0; $val=$bytes[$position+ 1] & 0xFF; $val=$val<< 8; $val|=$bytes[$position] & 0xFF; return $val; }     }

PHP byte array and string conversion class