PHP: improved response status code handling.

There's no reason to parse "http_status_line"; the PHP interpreter already
does this.  If the line contains a valid status code, it's assigned to
"http_response_code".

This also fixes invalid status line handling, where the nxt_int_parse()
function returned -1; it was cast to unsigned, yielding response code 65535.

src/nxt_php_sapi.c

@@ -730,7 +730,7 @@ static int
 nxt_php_send_headers(sapi_headers_struct *sapi_headers TSRMLS_DC)
 {
     int                      rc, fields_count;
-    char                     *colon, *status_line, *value;
+    char                     *colon, *value;
     uint16_t                 status;
     uint32_t                 resp_size;
     nxt_php_run_ctx_t        *ctx;
@@ -762,17 +762,7 @@ nxt_php_send_headers(sapi_headers_struct *sapi_headers TSRMLS_DC)
         resp_size += h->header_len;
     }
 
-    if (SG(sapi_headers).http_status_line) {
-        status_line = SG(sapi_headers).http_status_line;
-
-        status = nxt_int_parse((u_char *) status_line + 9, 3);
-
-    } else if (SG(sapi_headers).http_response_code) {
-        status = SG(sapi_headers).http_response_code;
-
-    } else {
-        status = 200;
-    }
+    status = SG(sapi_headers).http_response_code;
 
     rc = nxt_unit_response_init(req, status, fields_count, resp_size);
     if (nxt_slow_path(rc != NXT_UNIT_OK)) {

test/php/header/index.php

@@ -0,0 +1,4 @@
+<?php
+header($_SERVER['HTTP_X_HEADER']);
+header('Content-Length: 0');
+?>

test/test_php_application.py

@@ -102,6 +102,46 @@ class TestPHPApplication(TestApplicationPHP):
         self.assertEqual(resp['status'], 200, 'status')
         self.assertNotEqual(resp['body'], '', 'body not empty')
 
+    def test_php_application_header_status(self):
+        self.load('header')
+
+        self.assertEqual(
+            self.get(
+                headers={
+                    'Host': 'localhost',
+                    'Connection': 'close',
+                    'X-Header': 'HTTP/1.1 404 Not Found',
+                }
+            )['status'],
+            404,
+            'status',
+        )
+
+        self.assertEqual(
+            self.get(
+                headers={
+                    'Host': 'localhost',
+                    'Connection': 'close',
+                    'X-Header': 'http/1.1 404 Not Found',
+                }
+            )['status'],
+            404,
+            'status case insensitive',
+        )
+
+        self.assertEqual(
+            self.get(
+                headers={
+                    'Host': 'localhost',
+                    'Connection': 'close',
+                    'X-Header': 'HTTP/ 404 Not Found',
+                }
+            )['status'],
+            404,
+            'status version empty',
+        )
+
+
     def test_php_application_404(self):
         self.load('404')