MFB: Added missing format validator to unpack() function

ext/standard/pack.c

@@ -613,6 +613,12 @@ PHP_FUNCTION(unpack)
 			case 'd':
 				size = sizeof(double);
 				break;
+
+			default:
+				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid format type %c", type);
+				zval_dtor(return_value);
+				RETURN_FALSE;
+				break;
 		}
 
 		/* Do actual unpacking */

ext/standard/tests/strings/unpack.phpt

@@ -0,0 +1,11 @@
+--TEST--
+Invalid format type validation
+--FILE--
+<?php
+	var_dump(unpack("-2222", 1));
+	echo "Done\n";
+?>
+--EXPECTF--
+Warning: unpack(): Invalid format type - in %s/unpack.php on line %d
+bool(false)
+Done