Describes the sample code of phpbase64 encoding and decoding in detail.

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Php base64 encoding and decoding

1. encoding and decoding using custom rules

Instance

 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. complete base64 encoding and decoding using system functions

Instance 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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