Prevent fatal errors from leaking

src/Polyfill/Errors.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Eloquent\Phony\Polyfill;
+
+class Errors
+{
+    /**
+     * Clear the last runtime error.
+     *
+     * Prevents feature detection errors from leaking out into shutdown handlers
+     * that look at error_get_last().
+     *
+     * @return void
+     */
+    public static function errorClearLast()
+    {
+        // https://github.com/symfony/polyfill/blob/ba249100f5/src/Php70/Php70.php#L52-L61
+        set_error_handler([__CLASS__, 'silentHandler']);
+        @trigger_error('');
+        restore_error_handler();
+    }
+
+    /**
+     * @return false
+     */
+    public static function silentHandler()
+    {
+        return false;
+    }
+}

src/Reflection/FeatureDetector.php

@@ -11,6 +11,7 @@
 
 namespace Eloquent\Phony\Reflection;
 
+use Eloquent\Phony\Polyfill\Errors;
 use Eloquent\Phony\Reflection\Exception\UndefinedFeatureException;
 use Exception;
 use ReflectionClass;
@@ -186,6 +187,10 @@ public function standardFeatures()
                 return $detector->checkInternalClass('Error');
             },
 
+            'error.clear.last' => function ($detector) {
+                return function_exists('error_clear_last');
+            },
+
             'generator' => function ($detector) {
                 return $detector->checkInternalClass('Generator');
             },
@@ -513,6 +518,14 @@ public function checkStatement($source, $useClosure = true)
             // @codeCoverageIgnoreEnd
         }
 
+        if (false === $result && empty($e)) {
+            if ($this->isSupported('error.clear.last')) {
+                error_clear_last();
+            } else {
+                Errors::errorClearLast();
+            }
+        }
+
         error_reporting($reporting);
 
         return true === $result;