Fix $output result inconsistency

library/std/exec.php

@@ -4,13 +4,20 @@ function swoole_exec(string $command, &$output = null, &$returnVar = null)
     $result = Swoole\Coroutine::exec($command);
     if ($result) {
         $outputList = explode(PHP_EOL, $result['output']);
+        foreach ($outputList as &$value) {
+            $value = rtrim($value);
+        }
+        if ('' === ($endLine = end($outputList))) {
+            array_pop($outputList);
+            $endLine = end($outputList);
+        }
         if ($output) {
             $output = array_merge($output, $outputList);
         } else {
             $output = $outputList;
         }
         $returnVar = $result['code'];
-        return end($outputList);
+        return $endLine;
     } else {
         return false;
     }

php_swoole_library.h

@@ -17,13 +17,20 @@ static const char* swoole_library_source_std_exec =
     "    $result = Swoole\\Coroutine::exec($command);\n"
     "    if ($result) {\n"
     "        $outputList = explode(PHP_EOL, $result['output']);\n"
+    "        foreach ($outputList as &$value) {\n"
+    "            $value = rtrim($value);\n"
+    "        }\n"
+    "        if ('' === ($endLine = end($outputList))) {\n"
+    "            array_pop($outputList);\n"
+    "            $endLine = end($outputList);\n"
+    "        }\n"
     "        if ($output) {\n"
     "            $output = array_merge($output, $outputList);\n"
     "        } else {\n"
     "            $output = $outputList;\n"
     "        }\n"
     "        $returnVar = $result['code'];\n"
-    "        return end($outputList);\n"
+    "        return $endLine;\n"
     "    } else {\n"
     "        return false;\n"
     "    }\n"

tests/swoole_library/exec/exec/2.phpt

@@ -0,0 +1,23 @@
+--TEST--
+swoole_library/exec/exec: Fix $output result inconsistency
+--SKIPIF--
+<?php
+require __DIR__ . '/../../../include/skipif.inc';
+?>
+--FILE--
+<?php
+require __DIR__ . '/../../../include/bootstrap.php';
+
+$fileName = __DIR__ . '/exec_test.php';
+file_put_contents($fileName, "1   \r\n2\r\n3\r\n");
+
+exec('php ' . $fileName, $output1);
+
+Swoole\Runtime::enableCoroutine();
+go(function () use ($output1, $fileName) {
+    exec('php ' . $fileName, $output2);
+    Assert::same($output2, $output1);
+});
+
+?>
+--EXPECT--