php function 有什么好处？解决方案

<br />
$array = array('http://www.google.com.hk','http://www.baidu.com','http://www.1.com/','http://www.yahoo.com.cn');<br />
foreach($array as $url){<br />
    $ch = curl_init();<br />
	curl_setopt($ch, CURLOPT_URL, $url);<br />
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);<br />
	curl_setopt($ch, CURLOPT_HEADER, true);<br />
	curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)');<br />
	$html = curl_exec($ch);<br />
	curl_close($ch);<br />
	echo $html.'<hr />';<br />
	$html = NULL;<br />
        unset($html);<br />
}<br />

function get_html($url){<br />
	$ch = curl_init();<br />
	curl_setopt($ch, CURLOPT_URL, $url);<br />
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);<br />
	curl_setopt($ch, CURLOPT_HEADER, true);<br />
	curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)');<br />
	$html = curl_exec($ch);<br />
	curl_close($ch);<br />
	return $html;<br />
}<br />
$array = array('http://www.google.com.hk','http://www.baidu.com','http://www.1.com/','http://www.yahoo.com.cn');<br />
foreach($array as $url){<br />
    get_html($url);<br />
}