Detailed explanation of php base64 encoding and decoding examples

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php base64 encoding and decoding detailed explanation

1. Custom rule encoding and decoding

Example

##

 public function test_changinttoStr () {
    $intvalue1 = 1232344234;
    $intStr = '';
    $str = "Y 9 L F k g y 5 R o v i x I 1 a O f 8 U h d s 3 r 4 D M p l Q Z J X P q e b E 0 W S j B n 7 w V z m N 2 G c 6 T H C A K u t";
    $seq = explode(" ", $str);
    $intvalue = $intvalue1;
    while ($intvalue >= 62) {
      # code...
      $intStr = ($seq[$intvalue % 62]).$intStr ;
      $intvalue = (int)($intvalue / 62);
    }
    $intStr = ($seq[$intvalue]).$intStr;
    echo($intStr);
    $keySeq= array_flip($seq);
    $length = strlen($intStr);
    $value = 0;
    for ($i = $length -1; $i >=0; $i--) {
      $t = $keySeq[$intStr[$i]];
        $s = ($length - $i) - 1;
        $m = (pow(62, $s) * $t);
      $value += $m;
    }
    echo $value;
  }

2. Use system functions to complete base64-bit encoding and decoding

Example code:

 public function testArray(){
//    $str['a'] = 'sdfsdf';
//    $str['d'] = 'sdafsdf';
//    $newStr = $this->modifyArray($str);

    $value = gmp_strval(gmp_init('234234234234',10),62);

    $newValue = gmp_strval(gmp_init($value,62),10);
    
  }

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