- <?php
- class ascii {
- /**
- * 将 ascii 码转为字符串
- * @param type $str 要解码的字符串
- * @param type $prefix 前缀, 默认:&#
- * @return type
- */
- function decode($str, $prefix="&#") {
- $str = str_replace($prefix, "", $str);
- $a = explode(";", $str);
- foreach ($a as $dec) {
- if ($dec <128) {
- $utf .= chr($dec);
- } else if ($dec < 2048) {
- $utf .= chr(192 + (($dec - ($dec % 64)) / 64));
- $utf .= chr(128 + ($dec % 64));
- } else {
- $utf .= chr(224 + (($dec - ($dec % 4096)) / 4096));
- $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
- $utf .= chr(128 + ($dec % 64));
- }
- }
- return $utf;
- }
- /**
- * 将字符串转换为 ascii 码
- * @param type $c 要编码的字符串
- * @param type $prefix 前缀, 默认:&#
- * @return string
- */
- function encode($c, $prefix="&#") {
- $len = strlen($c);
- $a = 0;
- while ($a < $len) {
- $ud = 0;
- if (ord($c{$a})>= 0 && ord($c{$a}) <= 127) {
- $ud = ord($c{$a});
- $a += 1;
- } else if (ord($c{$a})>= 192 && ord($c{$a}) <= 223) {
- $ud = (ord($c{$a}) - 192) * 64 + (ord($c{$a + 1}) - 128);
- $a += 2;
- } else if (ord($c{$a})>= 224 && ord($c{$a}) <= 239) {
- $ud = (ord($c{$a}) - 224) * 4096 + (ord($c{$a + 1}) - 128) * 64 + (ord($c{$a + 2}) - 128);
- $a += 3;
- } else if (ord($c{$a})>= 240 && ord($c{$a}) <= 247) {
- $ud = (ord($c{$a}) - 240) * 262144 + (ord($c{$a + 1}) - 128) * 4096 + (ord($c{$a + 2}) - 128) * 64 + (ord($c{$a + 3}) - 128);
- $a += 4;
- } else if (ord($c{$a})>= 248 && ord($c{$a}) <= 251) {
- $ud = (ord($c{$a}) - 248) * 16777216 + (ord($c{$a + 1}) - 128) * 262144 + (ord($c{$a + 2}) - 128) * 4096 + (ord($c{$a + 3}) - 128) * 64 + (ord($c{$a + 4}) - 128);
- $a += 5;
- } else if (ord($c{$a})>= 252 && ord($c{$a}) <= 253) {
- $ud = (ord($c{$a}) - 252) * 1073741824 + (ord($c{$a + 1}) - 128) * 16777216 + (ord($c{$a + 2}) - 128) * 262144 + (ord($c{$a + 3}) - 128) * 4096 + (ord($c{$a + 4}) - 128) * 64 + (ord($c{$a + 5}) - 128);
- $a += 6;
- } else if (ord($c{$a})>= 254 && ord($c{$a}) <= 255) { //error
- $ud = false;
- }
- $scill .= $prefix.$ud.";";
- }
- return $scill;
- }
- }
- /*
- PHP 转 ASCII
- require_once "ascii_class.php";
- */
- $aa = new ascii;
- echo "<xmp>";
- echo $str = $aa->encode("PHP 二次开发: www.php2.cc");
- echo "</xmp>";
- echo $aa->decode($str);
- ?>
来源: https://www.php1.cn/detail/php-67686b4b6b.html