#!/usr/bin/php
<?php

class Process {

	public function open($command) {
		
		$descriptorspec	= array(
			0 => array('pipe', 'r'),
			1 => array('pipe', 'w'),
			2 => array('pipe', 'w')
		);
		
		$this->resource	= proc_open($command, $descriptorspec, $this->pipes, null, $_ENV);
			
	}
	
	public function read() {
	
		if (is_resource($this->resource)) {
	
			$retval	= '';
			$error = '';
			
			$stdin = $this->pipes[0];
			$stdout = $this->pipes[1];
			$stderr = $this->pipes[2];
			
			while (! feof($stdout)) {
				$retval	.= fgets($stdout);
			}
			
			while (! feof($stderr)) {
				$error .= fgets($stderr);
			}
			
			fclose($stdin);
			fclose($stdout);
			fclose($stderr);
			
			$exit_code = proc_close($this->resource);
		
		}
	
		if (! empty($error)) {
			throw new Exception($error);
		} else {
			return $retval;	
		}
	
	}
}

$hosts[] = 'google.com';
$hosts[] = 'google.co.uk';
$hosts[] = 'google.it';
$hosts[] = 'google.fr';
$hosts[] = 'google.de';

foreach ($hosts AS $host) {

	// Fork commands;
	$procs[$host] = new Process;
	$procs[$host]->open('dig '.$host.'');

}

foreach ($hosts AS $host) {

	try	{
		
		$output = $procs[$host]->read();
		$pattern = "/$domain\.\s*[0-9]+\s*IN\s*A\s*([^\s]+)/i";
		preg_match($pattern, $output, $matches);
		echo $host .' has ip '.$matches[1]."\n";
	
	}
	
	catch (Exception $error) {
			
		echo $error->getMessage() . "\n";
		
	}

}

?>