JAVA ObjectSerializer转PHP

java code

package com.demo.encrypt;

import java.io.ByteArrayInputStream;  
import java.io.ByteArrayOutputStream;  
import java.io.IOException;  
import java.io.ObjectInputStream;  
import java.io.ObjectOutputStream;  
import java.io.Serializable;

public class ObjectSerializer {

    public static  String serialize(Serializable obj) throws IOException {
        if (obj == null) return "";
        try {
            ByteArrayOutputStream serialObj = new ByteArrayOutputStream();
            ObjectOutputStream objStream = new ObjectOutputStream(serialObj);
            objStream.writeObject(obj);
            objStream.close();
            return encodeBytes(serialObj.toByteArray());
        } catch (Exception e) {
            throw new IOException();
        }
    }

    public static  Object deserialize(String str) throws IOException {
        if (str == null || str.length() == 0) return null;
        try {
            ByteArrayInputStream serialObj = new ByteArrayInputStream(decodeBytes(str));
            ObjectInputStream objStream = new ObjectInputStream(serialObj);
            return objStream.readObject();
        } catch (Exception e) {
            throw new IOException();
        }
    }

    public static  String encodeBytes(byte[] bytes) {
        StringBuffer strBuf = new StringBuffer();

        for (int i = 0; i < bytes.length; i++) {
            strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
            strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
        }

        return strBuf.toString();
    }

    public static  byte[] decodeBytes(String str) {
        byte[] bytes = new byte[str.length() / 2];
        for (int i = 0; i < str.length(); i+=2) {
            char c = str.charAt(i);
            bytes[i/2] = (byte) ((c - 'a') << 4);
            c = str.charAt(i+1);
            bytes[i/2] += (c - 'a');
        }
        return bytes;
    }

}

PHP code snippet

class Serializer{  
    public static function encodeBytes($bytes)
    {
        $strBuf = array();
        for ($i = 0, $n = strlen($bytes); $i < $n; $i++) {
            $strBuf[] = chr((ord($bytes[$i]) >> 4 & 0xF) + 97);
            $strBuf[] = chr((ord($bytes[$i]) & 0xF) + 97);
        }
        return implode("", $strBuf);
    }

    public static function decodeBytes($str)
    {
        $bytes = array();;
        for ($i = 0, $n = strlen($str); $i < $n; $i += 2) {
            $c = $str[$i];
            $bytes[$i / 2] = (ord($c) - 97) << 4;
            $c = $str[$i + 1];
            $bytes[$i / 2] += (ord($c) - 97);
            $bytes[$i / 2] = chr($bytes[$i / 2]);
        }
        return implode("", $bytes);
    }
}