问题
I am in a need of function that will encode and decode all the id's of a tree nodes. I function that will check if its a single string or array string or string with delimiters. I am having one plugin for encoding and decoding. here goes my plugin:
FIle:encode.class.php
<?php
/*-------------------------
Author: Jonathan Pulice
Date: July 26th, 2005
Name: JPEncodeClass v1
Desc: Encoder and decoder using patterns.
-------------------------*/
class Protector
{
var $Pattern = "";
var $PatternFlip = "";
var $ToEncode = "";
var $ToDecode = "";
var $Decoded = "";
var $Encoded = "";
var $Bug = false;
var $DecodePattern = "";
function Debug($on = true)
{
$this->Bug = $on;
}
function Encode()
{
$ar = explode(":", $this->Pattern);
$enc = $this->ToEncode;
if ($this->Bug) echo "<!-- BEGIN ENCODING -->\n";
foreach ($ar as $num => $ltr)
{
switch ($ltr)
{
case "E":
$enc = base64_encode($enc);
break;
case "D":
$enc = base64_decode($enc);
break;
case "R":
$enc = strrev($enc);
break;
case "I":
$enc = $this->InvertCase($enc);
break;
}
if ($this->Bug) echo "<!-- {$ltr}: {$enc} -->\n";
}
if ($this->Bug) echo "<!-------------------->\n\n";
@$this->Encoded = ($enc == $this->Str) ? "<font color='red'>No Encoding/Decoding Pattern Detected!</font>" : $enc;
return $this->Encoded;
}
function Decode()
{
$pattern = ($this->DecodePattern != "") ? $this->DecodePattern : $this->Pattern;
//Reverse the pattern
$this->PatternFlip($pattern);
//make into an array
$ar = explode(":", $this->PatternFlip);
$t = ($this->Encoded == "") ? $this->ToDecode : $this->Encoded;
if ($this->Bug) echo "<!-- BEGIN DECODING -->\n";
foreach ($ar as $num => $ltr)
{
switch ($ltr)
{
case "E":
$t = base64_encode($t);
break;
case "D":
$t = base64_decode($t);
break;
case "R":
$t = strrev($t);
break;
case "I":
$t = $this->InvertCase($t);
break;
}
if ($this->Bug) echo "<!-- {$ltr}: {$t} -->\n";
}
if ($this->Bug) echo "<!-------------------->\n\n";
$this->Decoded = ($t == $this->Encoded) ? "<font color='red'>No Encoding/Decoding Pattern Detected!</font>" : $t;
return $this->Decoded;
}
function MakePattern($len = 10)
{
//possible letters
// E - Base64 Encode
// R - Reverse String
// I - Inverse Case
$poss = array('E','R', 'I');
//generate a string
for ( $i = 0 ; $i < $len ; $i++ )
{
$tmp[] = $poss[ rand(0,2) ];
}
//echo $str. "<br>";
//fix useless pattern section RR II
$str = implode(":", $tmp);
//fix
$str = str_replace( 'R:R:R:R:R:R' , 'R:E:R:E:R:E' , $str );
$str = str_replace( 'R:R:R:R:R' , 'R:E:R:E:R' , $str );
$str = str_replace( 'R:R:R:R' , 'R:E:R:E' , $str );
$str = str_replace( 'R:R:R' , 'R:E:R' , $str );
$str = str_replace( 'R:R' , 'R:E' , $str );
//fix
$str = str_replace( 'I:I:I:I:I:I' , 'I:E:I:E:I:E' , $str );
$str = str_replace( 'I:I:I:I:I' , 'I:E:I:E:I' , $str );
$str = str_replace( 'I:I:I:I' , 'I:E:I:E' , $str );
$str = str_replace( 'I:I:I' , 'I:E:I' , $str );
$str = str_replace( 'I:I' , 'I:E' , $str );
//string is good, set as pattern
$this->Pattern = $str;
return $this->Pattern; //if we need it
}
function PatternFlip($pattern)
{
//reverse the pattern
$str = strrev($pattern);
$ar = explode(":", $str);
foreach ($ar as $num => $ltr)
{
switch ($ltr)
{
case "E":
$tmp[] = "D";
break;
case "D":
$tmp[] = "E";
break;
case "R":
$tmp[] = "R";
break;
case "I":
$tmp[] = "I";
break;
}
}
$rev = implode(":", $tmp);
$this->PatternFlip = $rev;
return $this->PatternFlip;
}
// This is my custom Case Invertor!
// if you would like to use this in a script, please credit it to me, thank you
function InvertCase($str)
{
//Do initial conversion
$new = strtoupper( $str );
//spluit into arrays
$s = str_split( $str );
$n = str_split( $new );
//now we step through each letter, and if its the same as before, we swap it out
for ($i = 0; $i < count($s); $i++)
{
if ( $s[$i] === $n[$i] ) //SWAP THE LETTER
{
//ge the letter
$num = ord( $n[$i] );
//see if the ord is in the alpha ranges ( 65 - 90 | 97 - 122 )
if ( ( $num >= 65 AND $num <= 90 ) OR ( $num >= 97 AND $num <= 122 ) )
{
if ($num < 97 ) { $num = $num + 32; }
else { $num = $num - 32; }
$newchr = chr($num);
$n[$i] = $newchr;
}
}
}
//join the new string back together
$newstr = implode("", $n);
return $newstr;
}
}
?>
By using the functions from this plugin I have to write a function to check for different conditions.
回答1:
I wrote you a prototype for an extended class from this base class. Not sure what $PatternFlip is for, its not accessible in this class so you'll have to change it as you see necessary. If you want the result in a different format you can add functions to the class.
class MyProtector extends Protector {
var $Object;
var $encode;//1 means encode, not 1 means decode
var $result;
function __MyProtector($obj="",$encode=0,$pattern="") {
$this->$Object=$obj;
if($encode){//encode object
$this->$EncodePattern=$pattern;
$this->$result=smartEncode($obj);
}else{//decode object
$this->$DecodePattern=$pattern;
$this->result=smartDecode($obj);
}
}
private function smartEncode($object){
//encodes string or array
if(is_array($object){
return encodeArray($object);
}else if(is_string($object)){
return encodeString($object);
}
return 0;
}
private function smartDecode($object){
//encodes string or array
if(is_string($object)&&strpos("&",$object)===1){
return encodeDelimiter($object);
}else if(is_string($object)){
return encodeString($object);
}
return 0;
}
private function decodeDelimiter($object){
$a=explode("&",$string);//will only work if your encoding does not include "&"!
$aDecoded=array();
$k=0;
foreach($a as $i){
$this->toDecode=$i;
$aDecoded[$k]=$this->Decode();
$k++;
}
return $aDecoded;
}
private function decodeString($s){
$this->toDecode=$s;
return $this->Decode();
}
private function encodeString($s){
$this->toEncode=$s;
return $this->Encode();
}
private function encodeArray($s){
foreach($s as $i){
$this->toEncode=$i;
$s=$s.$this->Encode()."&";
}
return $s;
}
//setters and getters
function getPattern(){
return $this->Pattern;
}
function getPatternFlip(){
return $this->Pattern;
}
function getPattern(){
return $this->Pattern;
}
//..etc
Example usage:
$o=new MyProtector($string,0,$pattern);
echo $o->$result; //returns encoded string
$o=new MyProtector($string,1,$pattern);
echo $o->$result; //returns decoded string
$o=new MyProtector($array,0,$pattern);
echo $o->$result; //returns decoded string with '&' inbetween encoded array entries
$o=new MyProtector($stringWithDelimiter,1,$pattern);
echo $o->$result;//returns decoded array
I'm sure there will be a few syntax errors, typos in there as I haven't compiled/tried the thing. Hope that helped.
来源：https://stackoverflow.com/questions/5322129/php-array-encoding-and-decodingneed-a-function-for-encoding-and-decoding-string