简单的PHP伪缓存并定时抓取某页面内容_PHP教程

<?php
function get_page_content()
{
	$url = "http://www.bkjia.com/";
	$contents = file_get_contents($url);
	//如果出现中文乱码使用下面代码
	//$getcontent = iconv("gb2312″, "utf-8″,$contents);
	//echo $contents;
	//$pos = strstr($contents, '<div class="hot_news">');
	//print_r($pos);
	$array = explode('<div class="hot_news">', $contents);
	$htmlarray = explode('<div class="car_tab border4">', $array[0]); // HTML部分
	$cssarray = explode('<div class="hometop">', $htmlarray[0]);
	$css_rem_inner = explode('<!--[if !IE]>导航<![endif]-->', $cssarray[0]);
	$css_min = explode('<script type="text/javascript" src="http://www.bkjia.com/ad_comm_t.js">', $css_rem_inner[0]);
	$str_css = $css_min[0];
	$head = '<base target="_blank"></base></head> ';
	$str_1 = '<div class="car_tab border4">';
	$str_html = $htmlarray[1]; 
	$content = $str_css.$head.$str_1.$str_html;
	return $content;
}
$cache_file = "tmp.html";
$cache_time = 60*60*24;
/**
ob_start();
echo $content;
file_put_contents($cacheFile,ob_get_contents());
ob_end_flush();
**/
echo date("Y-m-d H:i:s", time());
echo '<br />';
echo date("Y-m-d H:i:s", floor(@filemtime($cache_file)));
if(time() - $cache_time > floor(@filemtime($cache_file)) )
{
	$content = get_page_content();
	file_put_contents($cacheFile, $content);
	header('Location: http://www.bkjia.com/tmp.html');
}
else
{
	header('Location: http://www.bkjia.com/tmp.html');
}
?>