php實現(xiàn)java的byte數(shù)組轉(zhuǎn)換

由于工作需要，自己寫的一個php實現(xiàn)java的byte數(shù)組轉(zhuǎn)換的類。

/**
?* byte數(shù)組與字符串轉(zhuǎn)化類
?* @author zikie
?* Created on 2011-7-15
?*/

class Bytes {
???
??? /**
???? * 轉(zhuǎn)換一個String字符串為byte數(shù)組
???? * @param $str 需要轉(zhuǎn)換的字符串
???? * @param $bytes 目標byte數(shù)組
???? * @author Zikie
???? */
????
??? public static function getBytes($str) {

??? ??? $len = strlen($str);
??? ??? $bytes = array();
?? ??? ??? for($i=0;$i?? ??? ??? ??? if(ord($str[$i]) >= 128){
?? ??? ??? ??? ??? $byte = ord($str[$i]) - 256;
?? ??? ??? ??? }else{
?? ??? ??? ??? ??? $byte = ord($str[$i]);
?? ??? ??? ??? }
??????? ??? $bytes[] =? $byte ;
??? ??? }
??? ??? return $bytes;
??? }
???
??? /**
???? * 將字節(jié)數(shù)組轉(zhuǎn)化為String類型的數(shù)據(jù)
???? * @param $bytes 字節(jié)數(shù)組
???? * @param $str 目標字符串
???? * @return 一個String類型的數(shù)據(jù)
???? */
????
??? public static function toStr($bytes) {
??? ??? $str = '';
??? ??? foreach($bytes as $ch) {
??????? ??? $str .= chr($ch);
??? ??? }

?? ??? ??? return $str;
??? }
???
??? /**
???? * 轉(zhuǎn)換一個int為byte數(shù)組
???? * @param $byt 目標byte數(shù)組
???? * @param $val 需要轉(zhuǎn)換的字符串
???? * @author Zikie
???? */
???
??? public static function integerToBytes($val) {
??? ??? $byt = array();
??? ??? $byt[0] = ($val & 0xff);
??? ??? $byt[1] = ($val >> 8 & 0xff);
??? ??? $byt[2] = ($val >> 16 & 0xff);
??????? $byt[3] = ($val >> 24 & 0xff);
??????? return $byt;
??? }
???
??? /**
???? * 從字節(jié)數(shù)組中指定的位置讀取一個Integer類型的數(shù)據(jù)
???? * @param $bytes 字節(jié)數(shù)組
???? * @param $position 指定的開始位置
???? * @return 一個Integer類型的數(shù)據(jù)
???? */
????
??? public static function bytesToInteger($bytes, $position) {
??????? $val = 0;
??????? $val = $bytes[$position + 3] & 0xff;
??????? $val ??????? $val |= $bytes[$position + 2] & 0xff;
??????? $val ??????? $val |= $bytes[$position + 1] & 0xff;
??????? $val ??????? $val |= $bytes[$position] & 0xff;
??????? return $val;
??? }

??? /**
???? * 轉(zhuǎn)換一個shor字符串為byte數(shù)組
???? * @param $byt 目標byte數(shù)組
???? * @param $val 需要轉(zhuǎn)換的字符串
???? * @author Zikie
???? */
???
??? public static function shortToBytes($val) {
??? ??? $byt = array();
??? ??? $byt[0] = ($val & 0xff);
??????? $byt[1] = ($val >> 8 & 0xff);
??????? return $byt;
??? }
???
??? /**
???? * 從字節(jié)數(shù)組中指定的位置讀取一個Short類型的數(shù)據(jù)。
???? * @param $bytes 字節(jié)數(shù)組
???? * @param $position 指定的開始位置
???? * @return 一個Short類型的數(shù)據(jù)
???? */
????
??? public static function bytesToShort($bytes, $position) {
??????? $val = 0;
??????? $val = $bytes[$position + 1] & 0xFF;
??????? $val = $val ??????? $val |= $bytes[$position] & 0xFF;
??????? return $val;
??? }
???
}
?>