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3 liveuser 1 
<?php
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namespace React\EventLoop;
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/**
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 * @internal
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 */
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final class SignalsHandler
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{
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    private $signals = array();
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    public function add($signal, $listener)
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    {
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        if (!isset($this->signals[$signal])) {
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            $this->signals[$signal] = array();
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        }
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        if (\in_array($listener, $this->signals[$signal])) {
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            return;
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        }
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        $this->signals[$signal][] = $listener;
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    }
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    public function remove($signal, $listener)
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    {
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        if (!isset($this->signals[$signal])) {
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            return;
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        }
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        $index = \array_search($listener, $this->signals[$signal], true);
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        unset($this->signals[$signal][$index]);
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        if (isset($this->signals[$signal]) && \count($this->signals[$signal]) === 0) {
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            unset($this->signals[$signal]);
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        }
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    }
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    public function call($signal)
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    {
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        if (!isset($this->signals[$signal])) {
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            return;
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        }
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        foreach ($this->signals[$signal] as $listener) {
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            \call_user_func($listener, $signal);
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        }
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    }
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    public function count($signal)
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    {
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        if (!isset($this->signals[$signal])) {
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            return 0;
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        }
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        return \count($this->signals[$signal]);
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    }
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    public function isEmpty()
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    {
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        return !$this->signals;
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    }
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}