Fix bug #72596: imagetypes function won't advertise WEBP support

We add the constant IMG_WEBP and make sure that WebP support is properly
reported by imagetypes().

NEWS

@@ -23,6 +23,9 @@ PHP                                                                        NEWS
   . Fixed bug #72575 (using --allow-to-run-as-root should ignore missing user).
     (gooh)
 
+- GD:
+  . Fixed bug #72596 (imagetypes function won't advertise WEBP support). (cmb)
+
 - Intl:
   . Partially fixed #72506 (idn_to_ascii for UTS #46 incorrect for long domain
     names). (cmb)

UPGRADING

@@ -400,6 +400,9 @@ PHP 5.6 UPGRADE NOTES
 - CURL:
   CURL_HTTP_VERSION_2_0 and CURL_VERSION_HTTP2 (>= 5.6.8)
 
+- GD:
+  IMG_WEBP (>= 5.6.25)
+
 - LDAP:
   LDAP_ESCAPE_FILTER int(1)
   LDAP_ESCAPE_DN     int(2)

ext/gd/gd.c

@@ -1148,6 +1148,7 @@ PHP_MINIT_FUNCTION(gd)
 	REGISTER_LONG_CONSTANT("IMG_PNG", 4, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("IMG_WBMP", 8, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("IMG_XPM", 16, CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("IMG_WEBP", 32, CONST_CS | CONST_PERSISTENT);
 
 	/* special colours for gd */
 	REGISTER_LONG_CONSTANT("IMG_COLOR_TILED", gdTiled, CONST_CS | CONST_PERSISTENT);
@@ -2200,6 +2201,9 @@ PHP_FUNCTION(imagetypes)
 #if defined(HAVE_GD_XPM)
 	ret |= 16;
 #endif
+#ifdef HAVE_GD_WEBP
+	ret |= 32;
+#endif
 
 	if (zend_parse_parameters_none() == FAILURE) {
 		return;

ext/gd/tests/bug72596.phpt

@@ -0,0 +1,12 @@
+--TEST--
+Bug #72596 (imagetypes function won't advertise WEBP support)
+--SKIPIF--
+<?php
+if (!extension_loaded('gd')) die('skip gd extension not available');
+?>
+--FILE--
+<?php
+var_dump(function_exists('imagewebp') === (bool) (imagetypes() & IMG_WEBP));
+?>
+--EXPECT--
+bool(true)