diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index c0b638aabda1e..39fc4d3c92fb0 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -340,7 +340,7 @@ public function start(callable $callback = null, array $env = [])
 
         $envPairs = [];
         foreach ($env as $k => $v) {
-            if (false !== $v && 'argc' !== $k && 'argv' !== $k) {
+            if (false !== $v && false === \in_array($k, ['argc', 'argv', 'ARGC', 'ARGV'], true)) {
                 $envPairs[] = $k.'='.$v;
             }
         }
@@ -973,8 +973,6 @@ public function addErrorOutput(string $line)
 
     /**
      * Gets the last output time in seconds.
-     *
-     * @return float|null The last output time in seconds or null if it isn't started
      */
     public function getLastOutputTime(): ?float
     {
@@ -1503,8 +1501,6 @@ private function resetProcessData()
      * @param int  $signal         A valid POSIX signal (see https://php.net/pcntl.constants)
      * @param bool $throwException Whether to throw exception in case signal failed
      *
-     * @return bool True if the signal was sent successfully, false otherwise
-     *
      * @throws LogicException   In case the process is not running
      * @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed
      * @throws RuntimeException In case of failure