// If the psysh binary was included directly, assume they just wanted an
// autoloader and bail early.
+//
+// Keep this PHP 5.3 code around for a while in case someone is using a globally
+// installed psysh as a bin launcher for older local versions.
if (version_compare(PHP_VERSION, '5.3.6', '<')) {
$trace = debug_backtrace();
} elseif (version_compare(PHP_VERSION, '5.4.0', '<')) {