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HomeBackend DevelopmentPHP TutorialPHP读取汉字的点阵数据_php实例

项目中遇到的问题:

PHP如何读取汉字的点阵数据?想实现输入一段文字,能得到这一段文字的所有点阵码。

解决方法:

简体中文国标字库7445个字符,其中汉字6773个,包括一级汉字3755个,二级汉字3008个。采用2字节(16位二进制)编码。

区位码:国标GB2312规定,所有的国标汉字与符号组成一个94×94的矩阵。在此方阵中,每一行称为一个”区”,每一列称为一个”位”,因此,这个方阵实际上组成了一个有94个区(区号分别为0 1到94)、每个区内有94个位(位号分别为01到94)的汉字字符集。一个汉字所在的区号和位号简单地组合在一起就构成了该汉字的”区位码”。在汉字的区位码中,高两位为区号,低两位为位号。由此可见,区位码与汉字或符号之间是一一对应的。

内码:汉字的内码是指在计算机中表示汉字的编码。机内码与区位码稍有区别。目前,对于国内大多数的计算机系统,一个汉字的内码占两个字节,分别称为高位字节与低位字节,且这两位字节与区位码的关系如下: 内码高位=区码+A0H(H表示十六进制) 内码低位=位码+A0H 例如,汉字”啊”的区位码为”1601″,区码和位码分别用十六进制表示即为”1001H”,则它的内码为”B0A1H”。其中B0H为内码的高位字节,A1H为内码的低位字节。

返回由0和1组成的字符串

<&#63;php
/**
* 读取汉字点阵数据
*
*/

$str = "中华人民共和国";

$font_file_name = "simsun12.fon"; // 点阵字库文件名
$font_width = 12; // 单字宽度
$font_height = 12; // 单字高度
$start_offset = 0; // 偏移

$fp = fopen($font_file_name, "rb");

$offset_size = $font_width * $font_height / 8;
$string_size = $font_width * $font_height;
$dot_string = "";

for ($i = 0; $i < strlen($str); $i ++)
{
if (ord($str{$i}) > 160)
{
// 先求区位码,然后再计算其在区位码二维表中的位置,进而得出此字符在文件中的偏移
$offset = ((ord($str{$i}) - 0xa1) * 94 + ord($str{$i + 1}) - 0xa1) * $offset_size;
$i ++;
}
else
{
$offset = (ord($str{$i}) + 156 - 1) * $offset_size;
}

// 读取其点阵数据
fseek($fp, $start_offset + $offset, SEEK_SET);
$bindot = fread($fp, $offset_size);

for ($j = 0; $j < $offset_size; $j ++)
{
// 将二进制点阵数据转化为字符串
$dot_string .= sprintf("%08b", ord($bindot{$j}));
}
}

fclose($fp);

echo $dot_string;
&#63;>

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