本文实例讲述了PHP实现ASCII码与字符串相互转换的方法。分享给大家供大家参考，具体如下：
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<?phpclass 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编程：www.zzvips.com");echo "</xmp>";echo $aa->decode($str);?> |
希望本文所述对大家PHP程序设计有所帮助。
