51     private $callback;  variable in Symfony\\Component\\Process\\Process
195      * @param callable|null $callback A PHP callback to run whenever there is some
206     public function run($callback = null/*, array $env = []*/)  argument
209         $this->start($callback, $env);
227     public function mustRun(callable $callback = null/*, array $env = []*/)  argument
234         if (0 !== $this->run($callback, $env)) {
253      * @param callable|null $callback A PHP callback to run whenever there is some
260     public function start(callable $callback = null/*, array $env = [*/)  argument
279         $this->callback = $this->buildCallback($callback);
280         $this->hasCallback = null !== $callback;
363      * @param callable|null $callback A PHP callback to run whenever there is some
375     public function restart(callable $callback = null/*, array $env = []*/)  argument
383         $process->start($callback, $env);
395      * @param callable|null $callback A valid PHP callback
403     public function wait(callable $callback = null)  argument
409         if (null !== $callback) {
414             $this->callback = $this->buildCallback($callback);
576 …while (null !== $this->callback || ($yieldOut && !feof($this->stdout)) || ($yieldErr && !feof($thi…
1385      * @param callable|null $callback The user defined PHP callback
1389     protected function buildCallback(callable $callback = null)  argument
1392             return function ($type, $data) use ($callback) {
1393                 if (null !== $callback) {
1394                     \call_user_func($callback, $type, $data);
1401         return function ($type, $data) use ($callback, $out) {
1408             if (null !== $callback) {
1409                 \call_user_func($callback, $type, $data);
1511         $callback = $this->callback;
1514                 $callback(self::STDOUT === $type ? self::OUT : self::ERR, $data);
1548         $this->callback = null;
1559         $this->callback = null;