Call to undefined function pcntl_signal()

code

<?php

namespace App\Controller;

class A
{
    public function __construct()
    {
        parent::__construct();
        pcntl_signal(SIGTERM,array(&$this,"onExit"));
    }
}

bash

php index.php app/a/xx

错误信息

Call to undefined function App\Controller\pcntl_signal()

请问应该怎么纠正写法呢?

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