Support zend_version()

PEAR uses zend_version(). Let's support it too.

hphp/runtime/ext/ext_options.cpp

@@ -36,6 +36,8 @@
 
 #include "hphp/runtime/vm/request_arena.h"
 
+#define ZEND_VERSION "2.4.99"
+
 namespace HPHP {
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -858,7 +860,7 @@ String f_sys_get_temp_dir() {
 }
 
 String f_zend_logo_guid() {
-  throw NotSupportedException(__func__, "not zend anymore");
+  throw NotSupportedException(__func__, "deprecated and removed");
 }
 
 int64_t f_zend_thread_id() {
@@ -866,9 +868,10 @@ int64_t f_zend_thread_id() {
 }
 
 String f_zend_version() {
-  throw NotSupportedException(__func__, "not zend anymore");
+  return ZEND_VERSION;
 }
 
+
 ///////////////////////////////////////////////////////////////////////////////
 
 #define sign(n) ((n)<0?-1:((n)>0?1:0))

hphp/test/slow/ext_options/ext_options.php

@@ -36,3 +36,5 @@ var_dump(putenv("FOO=bar"));
 var_dump(!putenv("FOO"));
 
 var_dump(!version_compare("1.3.0.dev", "1.1.2", "<"));
+
+var_dump(version_compare(zend_version(), "2.4.99", ">="));

hphp/test/slow/ext_options/ext_options.php.expect

@@ -20,3 +20,4 @@ string(14) "5.4.999-hiphop"
 bool(true)
 bool(true)
 bool(true)
+bool(true)