Test against 32-bit PHP versions (#46)

* Add 32-bit images to test against

* Update memory test for 32-bit architectures.

We don't necessarily know how much memory is allocated across platforms.
We'll change this test to make sure that we are executing the loop more
than once, but fewer times than all.

Author: chingor13

cloudbuild.yaml

@@ -30,3 +30,9 @@ steps:
   - name: gcr.io/cloud-builders/docker
     args: ['build', '--build-arg', 'BASE_IMAGE=gcr.io/php-stackdriver/php71-debug', '.']
     id: php71-debug
+  - name: gcr.io/cloud-builders/docker
+    args: ['build', '--build-arg', 'BASE_IMAGE=gcr.io/php-stackdriver/php71-32bit', '.']
+    id: php71-32bit
+  - name: gcr.io/cloud-builders/docker
+    args: ['build', '--build-arg', 'BASE_IMAGE=gcr.io/php-stackdriver/php70-32bit', '.']
+    id: php70-32bit

tests/logpoints/memory_limit.phpt

@@ -7,7 +7,6 @@ $data = [];
 
 function logpoint_callback($level, $message) {
     global $data;
-    echo "logpoint: $level - $message" . PHP_EOL;
     $data[] = array_fill(0, 100000, 1);
 }
 // set a snapshot for line 7 in loop.php ($sum += $i)
@@ -16,14 +15,17 @@ var_dump(stackdriver_debugger_add_logpoint('loop.php', 7, 'INFO', 'Logpoint hit!
 ]));
 
 require_once(__DIR__ . '/loop.php');
-
 $sum = loop(10);
 
+// Check the number of times that the logpoint_callback was executed is
+// limited as it's hard to determine exact memory usage across systems
+$iterations = count($data);
+$test = ($iterations < 10) && ($iterations > 1);
+echo "Logpoint executed fewer than 10 times: $test" . PHP_EOL;
+
 echo "Sum is {$sum}\n";
 ?>
 --EXPECTF--
 bool(true)
-logpoint: INFO - Logpoint hit!
-logpoint: INFO - Logpoint hit!
-logpoint: INFO - Logpoint hit!
+Logpoint executed fewer than 10 times: 1
 Sum is 45