Detailed introduction to the sample code of php base64 encoding and decoding

This article mainly introduces relevant information about php base64 encoding and decoding example codes. Friends in need can refer to

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 the system function 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);
    
  }

The above is the detailed content of Detailed introduction to the sample code of php base64 encoding and decoding. For more information, please follow other related articles on the PHP Chinese website!