ужна функция, которая будет кодировать и декодировать все идентификаторы узлов дерева. Я функция, которая будет проверять, является ли его единственной строкой или строкой массива или строкой с разделителями. У меня есть один плагин для кодирования и декодирования. здесь идет мой плагин:

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;

    }

}

?>

Используя функции этого плагина, я должен написать функцию для проверки различных условий.