PHP converts ASCII codes and strings.

PHP converts ASCII codes and strings.

This document describes how to convert ASCII codes and strings in PHP. We will share this with you for your reference. The details are as follows:

<? Phpclass 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 Value: & # * @ return string */function encode ($ c, $ prefix = "& #") {$ len = strlen ($ c); $ a = 0; while ($ a <$ len) {$ ud = 0; if (ord ($ c {$ a}) >=0 & ord ($ c {$ }) <= 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})-12 8) * 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 to ASCII require_once "ascii_class.php"; */$ aa = new ascii; echo "<xmp> "; echo $ str = $ aa-> encode ("PHP Encoding Cheng: www.jb51.net "); echo" </xmp> "; echo $ aa-> decode ($ str);?>

PS: here we will provide you with two tools related to ASCII Code Conversion for your reference:

Native/ASCII online encoding conversion tool:
Http://tools.jb51.net/transcoding/native2ascii

Tools for online conversion between Chinese characters, ASCII codes, and Unicode codes:
Http://tools.jb51.net/transcoding/chinese2unicode