add static builder

content/talks/orleans-tech-programmation-fonctionnelle/examples/endOfSubscriptionIsNear.php

@@ -0,0 +1,26 @@
+<?php
+
+function endOfSubscriptionIsNear1(
+    DateTime $today,
+    DateTime $endOfSubscription
+) {
+    return $endOfSubscription < $today->modify('+15 days');
+}
+
+function endOfSubscriptionIsNear2(
+    DateTime $endOfSubscription
+) {
+    return $endOfSubscription < (new DateTime)->modify('+15 days');
+}
+
+$closedEndOfSubscription = (new DateTime)->modify('+14 days');
+$farEndOfSubscription = (new DateTime)->modify('+16 days');
+
+vprintf("Using new object should be 1: %d\n", endOfSubscriptionIsNear1(new DateTime, $closedEndOfSubscription));
+vprintf("Using new object should be 0: %d\n", endOfSubscriptionIsNear1(new DateTime, $farEndOfSubscription));
+
+$today = new DateTime;
+$endOfSubscription = (new DateTime)->modify('+16 days');
+
+vprintf("First call: %d\n", endOfSubscriptionIsNear1($today, $endOfSubscription));
+vprintf("Second call: %d\n", endOfSubscriptionIsNear1($today, $endOfSubscription));