Add well known types to php runtime. (#3697)

* Add well known types to php runtime.

* Fix php7.0 tests

* No longer generate empty.proto in test as it has been included in
runtime.

* Fix zts build

* Clean code

* Rename g_p_b_empty to empty.

* Don't generate code for empty.proto in compatibility test

* Fix 32-bit

* Fix mac build

* Fix Makefile.am to add new files

1 files changed, 27 insertions, 0 deletions

diff --git a/php/src/Google/Protobuf/Syntax.php b/php/src/Google/Protobuf/Syntax.php
new file mode 100644
index 00000000..bb7b7896
--- /dev/null
+++ b/php/src/Google/Protobuf/Syntax.php
@@ -0,0 +1,27 @@
+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/type.proto
+
+namespace Google\Protobuf;
+
+/**
+ * The syntax in which a protocol buffer element is defined.
+ *
+ * Protobuf enum <code>Google\Protobuf\Syntax</code>
+ */
+class Syntax
+{
+    /**
+     * Syntax `proto2`.
+     *
+     * Generated from protobuf enum <code>SYNTAX_PROTO2 = 0;</code>
+     */
+    const SYNTAX_PROTO2 = 0;
+    /**
+     * Syntax `proto3`.
+     *
+     * Generated from protobuf enum <code>SYNTAX_PROTO3 = 1;</code>
+     */
+    const SYNTAX_PROTO3 = 1;
+}
+