php pack、unpack、ord 函数使用方法（二进制源接口应用实例）

//A字符 
$str = (pack ( "A*", "中国" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//H字符 
$str = (pack ( "H*", "fffe" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//C字符 
$str = (pack ( "C*", "55", "56", "57" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//i字符 短整形 32位 4个字节 64位8个字节 
$str = (pack ( "i", "100" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//s字符 短整形 2个字节 
$str = (pack ( "s", "100" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//l字符 长整形 4个字节 
$str = (pack ( "l", "100" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//f字符 单精度浮点 4个字节 
$str = (pack ( "f", "100" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

//d字符 双精度浮点 8个字节 
$str = (pack ( "d", "100" ));
echo $str, "=", strlen ( $str ), "字节\n";
getAscill ( $str );
echo '<br/>';

function getAscill($str) {
	$arr = str_split ( $str );
	foreach ( $arr as $v ) {
		echo $v, "=", ord ( $v ), "\n";
	}
	echo "=============\r\n\r\n";
}

$code=array( 

"username"=>array("A20","张三adfb12"), 

"pass"=>array("A10","asdf*#1"), 

"age"=>array("C","23"), 

"birthday"=>array("I","19900101"), 

"email"=>array("A50","zhangsan@163.com")); 

$stream=join("\0",packByArr($code)); 

echo $stream,strlen($stream); 

 


file_put_contents("c:/1.txt",$stream);    //将流保存起来便于下面读取 

 

function packByArr($arr)  { 

         $atArr=array(); 

         foreach ($arr as $k=>$v) { 

                  $atArr[]=pack($v[0],$v[1]); 

         } 

         return $atArr; 

} 

function getAscill($str) { 

         $arr=str_split($str); 

         foreach ($arr as $v) { 

                  echo $v,"=",ord($v),"\n"; 

         } 

} 

$code=array( 

"username"=>array("A20"), 

"pass"=>array("A10"), 

"age"=>array("C"), 

"birthday"=>array("I"), 

"email"=>array("A50")); 

$stream=file_get_contents("c:/1.txt"); 

var_dump(packByArr($stream,$code)); 

function packByArr($str,$code) { 

         $Arr=explode("\0",$str); 

         $atArr=array(); 

         $i=0; 

         foreach ($code as $k=>$v) { 

                  $atArr[$k]=unpack($v[0],$Arr[$i]); 

                  $i++; 

         } 

         return $atArr; 

}