php 64進制生成和轉換類,也可以任意進制

2019-11-08 01:16:30

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class baseTransform{ PRivate $alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'; private $base = 0; public function __construct(){ $this -> base = strlen($this -> alphabet);//計算進制數 } //生成方法 public function transformBase($id) { $shortenedId = ''; if($id == 0){ $shortenedId = $this -> alphabet{0}; } while($id > 0){ $remainder = $id % $this -> base; $id = ($id-$remainder) / $this -> base; if($remainder == 0){ $shortenedId = $this -> alphabet{0} . $shortenedId; }else{ $shortenedId = $this -> alphabet{$remainder} . $shortenedId; } } return $shortenedId; } //轉換方法 public function transformDec($base_num){ $raw_base = $base_num; $data_length = strlen($raw_base); $dec_data = 0; for($i = 0; $i < $data_length; $i++){//每一位分別讀取 $mult = 1; for($j = $data_length - 1; $j > $i; $j--){//構造當前位需要乘的數 if($i == ($data_length - 1)){ $mult = 1; }else{ $mult = $mult * $this -> base; } } $dec_data += strpos($this -> alphabet, $raw_base{$i}) * $mult; //計算當前位數代表的十進制數，然后累加 } return $dec_data; }}//測試10000個數 $transform = new baseTransform(); for($i = 0; $i < 10000; $i ++){ //$base64 = sprintf('%05d', $i); $sring0 = $transform -> transformBase($i); echo $sring0."    "; echo preg_replace('/^0+/','',$sring0)."    "; echo $dec_num = $transform -> transformDec($sring0); //var_dump($dec_num); echo "</br>"; }

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