Detailed explanation of php base64 encoding and decoding examples-PHP Tutorial-php.cn

Detailed explanation of php base64 encoding and decoding examples

墨辰丷

Release： 2023-03-27 20:08:01

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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 = &#39;&#39;;
    $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;
  }

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

Example code:

 public function testArray(){
//    $str[&#39;a&#39;] = &#39;sdfsdf&#39;;
//    $str[&#39;d&#39;] = &#39;sdafsdf&#39;;
//    $newStr = $this->modifyArray($str);

    $value = gmp_strval(gmp_init(&#39;234234234234&#39;,10),62);

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

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