Add forgotten file

constants.php

@@ -0,0 +1,17 @@
+<?php
+// No sense is given nor necessary for those constants, as soon as
+// there's no colision.
+define("PGQ_EVENT_OK",     1);
+define("PGQ_EVENT_FAILED", 2);
+define("PGQ_EVENT_RETRY",  5);
+define("PGQ_ABORT_BATCH", 11);
+
+/**
+ * log levels
+ */
+define("FATAL",   60);
+define("ERROR",   50);
+define("WARNING", 40);
+define("NOTICE",  30);
+define("VERBOSE", 20);
+define("DEBUG",   10);