From 24c457742935077dcd4576ec189555dea8a0847c Mon Sep 17 00:00:00 2001
From: Michael Billington <michael.billington@gmail.com>
Date: Sun, 24 Feb 2019 14:52:24 +1100
Subject: [PATCH 1/3] add to CI, expected to break

---
 .travis.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index f5834e9..070dcca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@ php:
   - 7.1
   - 7.2
   - 7.3
+  - hhvm-3.21
+  - hhvm-3.27
   - nightly
   - hhvm-nightly
 

From d2b2cd21ab13727d2dbda6a42f151d8443045d47 Mon Sep 17 00:00:00 2001
From: Michael Billington <michael.billington@gmail.com>
Date: Sun, 24 Feb 2019 15:05:06 +1100
Subject: [PATCH 2/3] wrap error_get_last() and error_clear_last() for
 compatibility

---
 src/Mike42/GfxPhp/Image.php | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/Mike42/GfxPhp/Image.php b/src/Mike42/GfxPhp/Image.php
index 7af248f..6adcbd5 100644
--- a/src/Mike42/GfxPhp/Image.php
+++ b/src/Mike42/GfxPhp/Image.php
@@ -17,11 +17,10 @@ class Image
     public static function fromFile(string $filename) : RasterImage
     {
         // Attempt to catch the cause of any errors
-        error_clear_last();
+        self::clearLastError();
         $blob = @file_get_contents($filename);
         if ($blob === false) {
-            $e = error_get_last();
-            $error = (isset($e) && isset($e['message']) && $e['message'] != "") ? $e['message'] : "Check that the file exists and can be read.";
+            $error = self::getLastErrorOrDefault("Check that the file exists and can be read.");
             throw new \Exception("Could not retrieve image data from '$filename'. $error");
         }
         return self::fromBlob($blob, $filename);
@@ -47,4 +46,29 @@ public static function create(int $width, int $height, int $impl = self::IMAGE_B
     {
         return BlackAndWhiteRasterImage::create($width, $height);
     }
+
+    /**
+     * Call error_clear_last() if it exists. This is dependent on which PHP runtime is used.
+     */
+    private static function clearLastError()
+    {
+        if (function_exists('error_clear_last')) {
+            error_clear_last();
+        }
+    }
+
+    /**
+     * Retrieve the message from error_get_last() if possible. This is very useful for debugging, but it will not
+     * always exist or return anything useful.
+     */
+    private static function getLastErrorOrDefault(string $default)
+    {
+        if (function_exists('error_clear_last')) {
+            $e = error_get_last();
+            if (isset($e) && isset($e['message']) && $e['message'] != "") {
+                return $e['message'];
+            }
+        }
+        return $default;
+    }
 }

From 542211dd245192bae420fd2b09e77b0cc0052fe9 Mon Sep 17 00:00:00 2001
From: Michael Billington <michael.billington@gmail.com>
Date: Sun, 24 Feb 2019 15:08:35 +1100
Subject: [PATCH 3/3] configure HHVM to act as PHP7

---
 .travis.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.travis.yml b/.travis.yml
index 070dcca..d2f4f8b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,7 @@ install:
   - composer install
 
 before_script:
+  - bash -c 'if [[ $TRAVIS_PHP_VERSION == hhvm* ]]; then echo "hhvm.php7.all = 1" | sudo tee -a /etc/hhvm/php.ini; fi'
   - mkdir -p build/logs/
 
 script: