PHP realizes mutual conversion between ASCII code and string

This article mainly introduces the method of converting ASCII codes and strings in PHP, involving PHP string traversal, replacement, encoding conversion and other related operating skills. Friends in need can refer to the following

for details As follows:

<?php
class 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.jb51.net");
echo "</xmp>";
echo $aa->decode($str);
?>

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