+/**
+ * Format a backtrace line for debug output roughly like debug_print_backtrace() does.
+ * Exceptions already have this built in, but PEAR error objects just give us the array.
+ *
+ * @param int $n line number
+ * @param array $line per-frame array item from debug_backtrace()
+ * @return string
+ */
+function formatBacktraceLine($n, $line)
+{
+ $out = "#$n ";
+ if (isset($line['class'])) $out .= $line['class'];
+ if (isset($line['type'])) $out .= $line['type'];
+ if (isset($line['function'])) $out .= $line['function'];
+ $out .= '(';
+ if (isset($line['args'])) {
+ $args = array();
+ foreach ($line['args'] as $arg) {
+ // debug_print_backtrace seems to use var_export
+ // but this gets *very* verbose!
+ $args[] = gettype($arg);
+ }
+ $out .= implode(',', $args);
+ }
+ $out .= ')';
+ $out .= ' called at [';
+ if (isset($line['file'])) $out .= $line['file'];
+ if (isset($line['line'])) $out .= ':' . $line['line'];
+ $out .= ']';
+ return $out;
+}
+
+function checkMirror($action_obj, $args)