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

Original

3399 people have browsed it

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;
  }

Copy after login

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);
    
  }

Copy after login

The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

php implements reading and saving base64 encoded image content

JS implements 3des base64Detailed explanation of encryption and decryption algorithm steps

H5 mobile development Ajax uploads multiple Base64 format pictures to server

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