Mutual conversion between php ascii codes and strings

Mutual conversion between php ascii codes and strings

[Code] php code:

<? Php

Class ascii {

/**

* Convert the ascii code into a string.

* @ Param type $ str the string to be decoded

* @ Param type $ 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 a string to an ascii code

* @ Param type $ c the string to be encoded

* @ Param type $ 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 + = 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;

}

}

/*

Convert PHP to ASCII

Require_once "ascii_class.php ";

*/

$ Aa = new ascii;

Echo "<xmp> ";

Echo $ str = $ aa-> encode ("PHP secondary development: www. php2.cc ");

Echo "</xmp> ";

Echo $ aa-> decode ($ str );

?>