symfony
diff --git a/‎src/Symfony/Component/Process/Process.php
Lines changed: 15 additions & 15 deletions b/‎src/Symfony/Component/Process/Process.php
Lines changed: 15 additions & 15 deletions
diff --git a/‎src/Symfony/Component/Process/Tests/ProcessTest.php
Lines changed: 12 additions & 0 deletions b/‎src/Symfony/Component/Process/Tests/ProcessTest.php
Lines changed: 12 additions & 0 deletions
@@ -266,24 +266,25 @@ public function start(callable $callback = null)
         $this->callback = $this->buildCallback($callback);
         $this->hasCallback = null !== $callback;
         $descriptors = $this->getDescriptors();
+        $inheritEnv = $this->inheritEnv;
 
         $commandline = $this->commandline;
-        $envline = '';
 
-        if (null !== $this->env && $this->inheritEnv) {
+        $env = $this->env;
+        $envBackup = array();
+        if (null !== $env && $inheritEnv) {
             if ('\\' === DIRECTORY_SEPARATOR && !empty($this->options['bypass_shell']) && !$this->enhanceWindowsCompatibility) {
                 throw new LogicException('The "bypass_shell" option must be false to inherit environment variables while enhanced Windows compatibility is off');
             }
-            $env = '\\' === DIRECTORY_SEPARATOR ? '(SET %s)&&' : 'export %s;';
-            foreach ($this->env as $k => $v) {
-                $envline .= sprintf($env, ProcessUtils::escapeArgument("$k=$v"));
+
+            foreach ($env as $k => $v) {
+                $envBackup[$k] = getenv($v);
+                putenv(false === $v || null === $v ? $k : "$k=$v");
             }
             $env = null;
-        } else {
-            $env = $this->env;
         }
         if ('\\' === DIRECTORY_SEPARATOR && $this->enhanceWindowsCompatibility) {
-            $commandline = 'cmd /V:ON /E:ON /D /C "('.$envline.$commandline.')';
+            $commandline = 'cmd /V:ON /E:ON /D /C "('.$commandline.')';
             foreach ($this->processPipes->getFiles() as $offset => $filename) {
                 $commandline .= ' '.$offset.'>'.ProcessUtils::escapeArgument($filename);
             }
@@ -297,18 +298,20 @@ public function start(callable $callback = null)
             $descriptors[3] = array('pipe', 'w');
 
             // See https://unix.stackexchange.com/questions/71205/background-process-pipe-input
-            $commandline = $envline.'{ ('.$this->commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
+            $commandline = '{ ('.$this->commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
             $commandline .= 'pid=$!; echo $pid >&3; wait $pid; code=$?; echo $code >&3; exit $code';
 
             // Workaround for the bug, when PTS functionality is enabled.
             // @see : https://bugs.php.net/69442
             $ptsWorkaround = fopen(__FILE__, 'r');
-        } elseif ('' !== $envline) {
-            $commandline = $envline.$commandline;
         }
 
         $this->process = proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $env, $this->options);
 
+        foreach ($envBackup as $k => $v) {
+            putenv(false === $v ? $k : "$k=$v");
+        }
+
         if (!is_resource($this->process)) {
             throw new RuntimeException('Unable to launch a new process.');
         }
@@ -1104,10 +1107,7 @@ public function setEnv(array $env)
             return !is_array($value);
         });
 
-        $this->env = array();
-        foreach ($env as $key => $value) {
-            $this->env[$key] = (string) $value;
-        }
+        $this->env = $env;
 
         return $this;
     }
 
@@ -1391,6 +1391,18 @@ public function testChainedProcesses()
         $this->assertSame('456', $p2->getOutput());
     }
 
+    public function testSetBadEnv()
+    {
+        $process = $this->getProcess('echo hello');
+        $process->setEnv(array('bad%%' => '123'));
+        $process->inheritEnvironmentVariables(true);
+
+        $process->run();
+
+        $this->assertSame('hello'.PHP_EOL, $process->getOutput());
+        $this->assertSame('', $process->getErrorOutput());
+    }
+
     public function testInheritEnvEnabled()
     {
         $process = $this->getProcess(self::$phpBin.' -r '.escapeshellarg('echo serialize($_SERVER);'), null, array('BAR' => 'BAZ'));