php

//a字符

$str=(pack("a*", "中国"));

echo $str,"=",strlen($str),"字节n";

getascill($str);

//h字符

$str=(pack("h*", "fffe"));

echo $str,"=",strlen($str),"字节n";

getascill($str);

//c字符

$str=(pack("c*", "55","56","57"));

echo $str,"=",strlen($str),"字节n";

getascill($str);

//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);

//s字符 短整形 2个字节

$str=(pack("s", "100"));

echo $str,"=",strlen($str),"字节n";

getascill($str);

//l字符 长整形 4个字节

$str=(pack("l", "100"));

echo $str,"=",strlen($str),"字节n";

getascill($str);

//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);

//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);

function getascill($str)

{

$arr=str_split($str);

foreach ($arr as $v)

{

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

}

echo "=============rnrn";

}

?>