Conversion between PHP ASCII code and string_PHP tutorial

Conversion between PHP ASCII code and string

[Code]php code:

　

class ascii {

　/**

* Convert ascii code to string

* @param type $str The string to be decoded

* @param type $prefix prefix, default:&#

* @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;

　}

　/**

* Convert string to ascii code

* @param type $c The string to be encoded

* @param type $prefix prefix, default: &#

* @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) {

　56 $ud = (ord($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 to ASCII

require_once "ascii_class.php";

　*/

$aa = new ascii;

echo "

";</p> <p> echo $str = $aa->encode("PHP secondary development: www.php2.cc");</p> <p> echo "";

echo $aa->decode($str);

　?>

http://www.bkjia.com/PHPjc/1050525.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1050525.htmlTechArticleMutual conversion between PHP ASCII code and string [code]php code: ?php class ascii { /** * Convert ascii code to string* @param type $str String to decode* @param type $prefix Prefix...