A PHP encryption and decryption class for numbers_PHP tutorial

Copy code The code is as follows:

/**
* Encryption and decryption class
* This algorithm only supports encrypted numbers. It is more suitable for encryption and decryption of id fields in databases, and encryption of URLs displayed based on numbers.
* @author Late Autumn Bamboo
* @version alpha
* @Encryption principle mark length + padding + number replacement
* @Encryption steps:
* Change a-z,A-Z,0- 9 62 characters are scrambled, take the first M (maximum number of digits in a number) digits as the mark length string, take the M+1 to M+10th digits as the digit replacement string, and the rest are fill-in strings
* 1. Calculate the number length n, and take the nth digit of the garbled code as the mark length.
* 2. Calculate the length of the complement. The length of the encrypted string N -1 - n is the length of the complement. Obtain the complement string according to the specified algorithm.
* 3. Replace the numbers according to the number replacement string to get the digital encrypted string.
* Mark length character + padded string + digital encrypted string = encrypted string
* Usage:
* $obj = new XDeode(9);
* $e_txt = $obj-> ;encode(123);
* echo $e_txt.'
';
* echo $key->decode($e_txt);
*/

class $key = 2543.5415412812){
$this->key = $key;
$this->length = $length;
$this->codelen = substr($this->strbase,0, $this->length);
$this->codenums = substr($this->strbase,$this->length,10);
$this->codeext = substr($ this->strbase,$this->length + 10);
}


function encode($nums){

$rtn = "";

$numslen = strlen($nums);
//The length of the first digit of the ciphertext mark
$begin = substr($this->codelen,$numslen - 1,1);

//Extension bits of ciphertext
$extlen = $this->length - $numslen - 1;

$temp = str_replace('.', '', $nums / $this-> ;key);

$temp = substr($temp,-$extlen);

$arrextTemp = str_split($this->codeext);
$arrext = str_split($temp);

foreach ($arrext as $v) {

$rtn .= $arrextTemp[ $v];
}

$arrnumsTemp = str_split($this->codenums);
$arrnums = str_split($nums);

foreach ($arrnums as $v) {

$rtn .= $arrnumsTemp[ $v];
}
return $begin.$rtn;
}


function decode($code){

$begin = substr($code,0,1);
$rtn = '';

$len = strpos($this->codelen,$begin);

if($ len!== false){
$len++;
$arrnums = str_split(substr($code,-$len));
foreach ($arrnums as $v) {
$rtn . = strpos($this->codenums,$v);
}
}

return $rtn;
}
}

/**** Example ****/
$begin = 9950;

$end = $begin + 50;

$obj = new XDeode(9);
for($i= $begin;$i<$end;$i++){
$en = $obj->encode($i);
$de = $obj->decode($en);
echoln("[{$i}]=[{$en}]=[{$de}]");
}

function echoln($str){
echo "{$str}
";

}

?>

Results of running the example:

[9950]=[vmizxPPga]=[9950]
[9951]=[vSNSSPPgk]=[9951]
[9952]=[vNQNyPPgV]=[9952]
[9953]=[ vyyJJPPgj]=[9953]
[9954]=[vNzQzPPgq]=[9954]
[9955]=[vyNzmPPgg]=[9955]
[9956]=[vXxSNPPge]=[9956]
[9957]=[vXJJJPPgW]=[9957]
[9958]=[vXziQPPgU]=[9958]
[9959]=[viXxSPPgP]=[9959]
[9960]=[vQxmyPPea] =[9960]
[9961]=[viJyJPPek]=[9961]

http://www.bkjia.com/PHPjc/743929.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/743929.htmlTechArticleCopy the code code as follows: ?php /** * Encryption and decryption class* This algorithm only supports encrypted numbers. It is more suitable for encryption and decryption of id fields in databases, and encryption of URLs displayed based on numbers. ...