Fix #73157: imagegd2() ignores 3rd param if 4 are given

We must initialize `q` for *more* than three parameters, too.

NEWS

@@ -26,6 +26,7 @@ PHP                                                                        NEWS
     cmb)
   . Fixed bug #53504 (imagettfbbox gives incorrect values for bounding box).
     (Mark Plomer, cmb)
+  . Fixed bug #73157 (imagegd2() ignores 3rd param if 4 are given). (cmb)
 
 - Mbstring:
   . Fixed bug #72994 (mbc_to_code() out of bounds read). (Laruence, cmb)

ext/gd/gd.c

@@ -2614,11 +2614,11 @@ static void _php_image_output(INTERNAL_FUNCTION_PARAMETERS, int image_type, char
 
 	if (argc > 1) {
 		fn = file;
-		if (argc == 3) {
+		if (argc >= 3) {
 			q = quality;
-		}
-		if (argc == 4) {
-			t = type;
+			if (argc == 4) {
+				t = type;
+			}
 		}
 	}
 

ext/gd/tests/bug73157.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Bug #73157 (imagegd2() ignores 3rd param if 4 are given)
+--SKIPIF--
+<?php
+if (!extension_loaded('gd')) die('skip gd extension not available');
+?>
+--FILE--
+<?php
+$im = imagecreate(8, 8);
+imagecolorallocate($im, 0, 0, 0);
+
+ob_start();
+imagegd2($im, null, 256, IMG_GD2_RAW);
+$buffer = ob_get_clean();
+
+$header = unpack('@10/nchunk_size', $buffer);
+printf("chunk size: %d\n", $header['chunk_size']);
+?>
+===DONE===
+--EXPECT--
+chunk size: 256
+===DONE===