async PHP Console I/O, Needs pthreads https://github.com/krakjoe/pthreads/

IO.php

<?php

if(!extension_loaded("pthreads") and @dl((PHP_SHLIB_SUFFIX === "dll" ? "php_":"") . "pthreads." . PHP_SHLIB_SUFFIX) === false){
  trigger_error("Unable to find pthreads extension", E_USER_ERROR);
	exit(1);
}


function kill($pid){
	$uname = strtoupper(php_uname("s"));
	if(strpos($uname, "WIN") !== false){
		$os = "win";
	}elseif(strpos($uname, "DARWIN") !== false){
		$os = "mac";
	}else{
		$os = "linux";
	}
	switch($os){
		case "win":
			ob_start();
			passthru("%WINDIR%\\System32\\taskkill.exe /F /PID ".((int) $pid));
			ob_end_clean();
			break;
		case "mac":
		case "linux":
		default:
			ob_start();
			passthru("kill -9 ".((int) $pid));
			ob_end_clean();
	}
}

class ConsoleLoop extends Thread{
	var $line = false, $stop = false;
	public function run(){
		$fp = fopen("php://stdin", "r");
		while($this->stop === false and ($line = fgets($fp)) !== false){
			$this->line = $line;
			$this->wait();
			$this->line = false;
		}
		exit(0);
	}
}

class ConsoleIO{
	private $loop;
	public function __construct(){
		$this->loop = new ConsoleLoop;
		$this->loop->start();
	}

	public function __destruct(){
		$this->loop->stop = true;
		$this->loop->notify();
		$this->loop->join(); //segfault lol
	}
	
	public function input($block = false){
		do{
			if($this->loop->line !== false){
				$line = trim($this->loop->line);
				$this->loop->notify();
				return $line;
			}
			usleep(1);
		}while($block === true);
		return false;
	}
	
	public function output($output, $EOL = true){
		echo $output . ($EOL === true ? PHP_EOL : "");
	}
}


$io = new ConsoleIO;
$io->input(true); //if block == true, this function will only return when input is available

//Warning! pthreads implementation in PHP is buggy. When closing the script, you'll have to kill it.
kill(getmypid()); //Fix for segfault