Allow module to proclaim compatibility with any Zend version

Zend/zend_extensions.c

@@ -64,17 +64,19 @@ int zend_load_extension(char *path)
 		return FAILURE;
 	}
 
-	if (extension_version_info->zend_extension_api_no > ZEND_EXTENSION_API_NO) {
-		fprintf(stderr, "%s requires Zend Engine API version %d\n"
+
+	/* allow extension to proclaim compatibility with any Zend version */
+	if(extension_version_info->zend_extension_api_no != ZEND_EXTENSION_API_NO &&(!new_extension->api_no_check || new_extension->api_no_check(ZEND_EXTENSION_API_NO) != SUCCESS)) {
+		if (extension_version_info->zend_extension_api_no > ZEND_EXTENSION_API_NO) {
+			fprintf(stderr, "%s requires Zend Engine API version %d\n"
 					"The installed Zend Engine API version is %d\n\n",
 					new_extension->name,
 					extension_version_info->zend_extension_api_no,
 					ZEND_EXTENSION_API_NO);
-		DL_UNLOAD(handle);
-		return FAILURE;
-	} else if (extension_version_info->zend_extension_api_no < ZEND_EXTENSION_API_NO) {
-		/* we may be able to allow for downwards compatability in some harmless cases. */
-		fprintf(stderr, "%s designed to be used with the Zend Engine API %d is outdated\n"
+			DL_UNLOAD(handle);
+			return FAILURE;
+		} else if (extension_version_info->zend_extension_api_no < ZEND_EXTENSION_API_NO) {
+			fprintf(stderr, "%s designed to be used with the Zend Engine API %d is outdated\	n"
 					"It requires a more recent version of the Zend Engine\n"
 					"The installed Zend Engine API version is %d\n"
 					"Contact %s at %s for a later version of this module.\n\n",
@@ -83,8 +85,9 @@ int zend_load_extension(char *path)
 					ZEND_EXTENSION_API_NO,
 					new_extension->author,
 					new_extension->URL);
-		DL_UNLOAD(handle);
-		return FAILURE;
+			DL_UNLOAD(handle);
+			return FAILURE;
+		} 
 	} else if (ZTS_V!=extension_version_info->thread_safe) {
 		fprintf(stderr, "Cannot load %s - it %s thread safe, whereas Zend %s\n",
 					new_extension->name,

Zend/zend_extensions.h

@@ -23,7 +23,7 @@
 
 #include "zend_compile.h"
 
-#define ZEND_EXTENSION_API_NO		20001002
+#define ZEND_EXTENSION_API_NO	20001002	
 
 typedef struct _zend_extension_version_info {
 	int zend_extension_api_no;
@@ -58,7 +58,7 @@ struct _zend_extension {
 	void (*op_array_ctor)(zend_op_array *op_array);
 	void (*op_array_dtor)(zend_op_array *op_array);
 
-	void *reserved1;
+	int  (*api_no_check)(int api_no);
 	void *reserved2;
 	void *reserved3;
 	void *reserved4;
@@ -82,6 +82,7 @@ ZEND_API void zend_extension_dispatch_message(int message, void *arg);
 	ZEND_EXT_API zend_extension_version_info extension_version_info = { ZEND_EXTENSION_API_NO, ZEND_VERSION, ZTS_V, ZEND_DEBUG }
 
 #define STANDARD_ZEND_EXTENSION_PROPERTIES NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, -1
+#define COMPAT_ZEND_EXTENSION_PROPERTIES   NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, -1
 
 
 ZEND_API extern zend_llist zend_extensions;