Home >Backend Development >PHP Tutorial >Conversion between PHP ASCII code and string_PHP tutorial
Conversion between PHP ASCII code and string_PHP tutorial
- WBOYOriginal
- 2016-07-13 09:44:08905browse
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 "
echo $aa->decode($str);
?>