PHP socket 接收 java端口 netty 网络字节序

java 服务端测试代码：

@Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {

        buffer.writeShort(5);
        buffer.writeInt(-51321);
        buffer.writeFloat(-123);
        buffer.writeDouble(-1121);
        buffer.writeBytes("测试测试ing123".getBytes());


        ctx.write(buffer, promise);

    }

PHP 端接收代码：

<?php

$host = 'xxxx';
$port = 9876;

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("Could not create socket.\n");
$connection = socket_connect($socket, $host, $port) or die("Could not connect server.\n");
//socket_write($socket, json_encode(['age'=>"333", 'name'=>'aaa', "bb"=>121])) or die("Write failed.\n");

$ret = socket_recv($socket, $msg, 130, MSG_PEEK  );


$bytes = Bytes::initBytes($msg);
$short = $bytes->readShort();
$int = $bytes->readInt();
$float = $bytes->readFloat();
$double = $bytes->readDouble();
$string = $bytes->readString(100);

var_dump($double);die();


class Bytes{

    private $buffer = null;
    private $readIdx= 0;
    private $maxLength = 0;

    const BIG_ENDIAN  = 1 ;
    const LITTLE_ENDIAN = 2;
    const WAITING_CHECK = -1;
    private static $result = -1;

    const INT_LEN = 4;
    const SHORT_LEN= 2;
    const FLOAT_LEN = 4;
    const DOUBLE_LEN = 8;

    //判断本地字节序
    public static function getEndian(){

        if( static::$result == static::WAITING_CHECK ){
            static::$result = self::LITTLE_ENDIAN;
            if(  pack('L', 1) === pack('N', 1) ){
                static::$result == static::BIG_ENDIAN;
            }
        }
        return static::$result;
    }


    public static function initBytes( $buffers ){
        return new static( $buffers );
    }

    private function __construct($buff){
        $this->buffer = $buff;
        $this->maxLength = strlen($buff);
    }

    public function readShort(){
        $short = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $short = unpack( 's' ,  substr( $this->buffer, $this->readIdx, static::SHORT_LEN )  );
        }else{
            $short = unpack( 's', strrev( substr( $this->buffer, $this->readIdx, static::SHORT_LEN ) ));
        }
        $this->updateReadIdx(static::SHORT_LEN);
        return $short;
    }

    public function readInt(){
        $int = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $int = unpack( 'i' ,  substr( $this->buffer, $this->readIdx, static::INT_LEN )  );
        }else{
            $int = unpack( 'i', strrev( substr( $this->buffer, $this->readIdx, static::INT_LEN ) ));
        }
        $this->updateReadIdx(static::INT_LEN);
        return $int;
    }

    public function readString( $length = 100 ){
        $str = "";
        $len = min( $length, $this->maxLength - $this->readIdx );
        for( $i = $this->readIdx; $i < $this->readIdx+$len; $i++ ){
            $str .=  $this->buffer[$i];
        }
        $this->updateReadIdx($len);
        return $str;
    }


    public function readFloat(){

        $float = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $float = unpack( 'f' ,  substr( $this->buffer, $this->readIdx, static::FLOAT_LEN )  );
        }else{
            $float = unpack( 'f', strrev( substr( $this->buffer, $this->readIdx, static::FLOAT_LEN ) ));
        }
        $this->updateReadIdx(static::FLOAT_LEN);
        return $float;

    }

    public function readDouble(){
        $double = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $double = unpack( 'd' ,  substr( $this->buffer, $this->readIdx, static::DOUBLE_LEN )  );
        }else{
            $double = unpack( 'd', strrev( substr( $this->buffer, $this->readIdx, static::DOUBLE_LEN ) ));
        }
        $this->updateReadIdx(static::DOUBLE_LEN);
        return $double;
    }

    private function updateReadIdx( $length ){
        $this->readIdx += $length;
    }

}


?>

 PHP 本地测试 ：

/**
 * @author sukura
 */

$bytes = Bytes::initBytes();
$bytes->writeDouble(-5.123)->writeInt(5.3)->writeFloat(-12.123);
var_dump($bytes->readDouble());
var_dump($bytes->readInt());
var_dump($bytes->readFloat());


class Bytes{

    private $buffer = null;
    private $readIdx= 0;
    private $maxLength = 0;

    const BIG_ENDIAN  = 1 ;
    const LITTLE_ENDIAN = 2;
    const WAITING_CHECK = -1;
    private static $result = -1;

    const INT_LEN = 4;
    const SHORT_LEN= 2;
    const FLOAT_LEN = 4;
    const DOUBLE_LEN = 8;

    public static function getEndian(){

        if( static::$result == static::WAITING_CHECK ){
            static::$result = self::LITTLE_ENDIAN;
            if(  pack('L', 1) === pack('N', 1) ){
                static::$result == static::BIG_ENDIAN;
            }
        }
        return static::$result;
    }


    public static function initBytes( $buffers = null ){
        return new static( $buffers );
    }

    private function __construct( $buff = null ){
        $this->buffer = $buff;
        $this->maxLength = strlen($buff);
    }

    public function readShort(){
        $short = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $short = unpack( 's' ,  substr( $this->buffer, $this->readIdx, static::SHORT_LEN )  );
        }else{
            $short = unpack( 's', strrev( substr( $this->buffer, $this->readIdx, static::SHORT_LEN ) ));
        }
        $this->updateReadIdx(static::SHORT_LEN);
        return $short;
    }

    public function readInt(){
        $int = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $int = unpack( 'i' ,  substr( $this->buffer, $this->readIdx, static::INT_LEN )  );
        }else{
            $int = unpack( 'i', strrev( substr( $this->buffer, $this->readIdx, static::INT_LEN ) ));
        }
        $this->updateReadIdx(static::INT_LEN);
        return $int;
    }

    public function readString( $length = 100 ){
        $str = "";
        $len = min( $length, $this->maxLength - $this->readIdx );
        for( $i = $this->readIdx; $i < $this->readIdx+$len; $i++ ){
            $str .=  $this->buffer[$i];
        }
        $this->updateReadIdx($len);
        return $str;
    }


    public function readFloat(){

        $float = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $float = unpack( 'f' ,  substr( $this->buffer, $this->readIdx, static::FLOAT_LEN )  );
        }else{
            $float = unpack( 'f', strrev( substr( $this->buffer, $this->readIdx, static::FLOAT_LEN ) ));
        }
        $this->updateReadIdx(static::FLOAT_LEN);
        return $float;

    }

    public function readDouble(){
        $double = 0;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $double = unpack( 'd' ,  substr( $this->buffer, $this->readIdx, static::DOUBLE_LEN )  );
        }else{
            $double = unpack( 'd', strrev( substr( $this->buffer, $this->readIdx, static::DOUBLE_LEN ) ));
        }
        $this->updateReadIdx(static::DOUBLE_LEN);
        return $double;
    }

    public function writeInt( $intVal ){
        $byte = null;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $byte = pack('i',  $intVal);
        }else{
            $byte = strrev( pack( 'i' , $intVal ) );
        }
        $this->mergeByte($byte);
        return $this;
    }


    public function writeFloat( $floatVal ){
        $byte = null;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $byte = pack('f',  $floatVal);
        }else{
            $byte = strrev( pack( 'f' , $floatVal ) );
        }
        $this->mergeByte($byte);
        return $this;
    }

    public function writeString( $strVal ){
        $byte = null;
        $len = strlen($strVal);
        $formate = "a{$len}";
        if( static::getEndian() == static::BIG_ENDIAN ){
            $byte = pack($formate,  $strVal);
        }else{
            $byte = strrev( pack( $formate , $strVal ) );
        }
        $this->mergeByte($byte);
        return $this;
    }


    public function writeDouble( $doubleVal ){
        $byte = null;
        if( static::getEndian() == static::BIG_ENDIAN ){
            $byte = pack('d',  $doubleVal);
        }else{
            $byte = strrev( pack( 'd' , $doubleVal ) );
        }
        $this->mergeByte($byte);
        return $this;
    }

    private function mergeByte( $bytes ){
        return $this->buffer .= $bytes;
    }

    private function updateReadIdx( $length ){
        $this->readIdx += $length;
    }

}