php读取html并截取字符串的简单代码

<?php
$title='';
$hello='jb51.net!';
$file=file_get_contents('http://www.baidu.com');
$file=iconv("gbk//ignore","utf-8",$file);
//echo $file;
echo strpos($file,'<title>');
echo substr($file,strpos($file,'<title>')+7,strpos($file,'</title>'-strpos($file,'<title>')+7));
$file=str_replace(array('百度一下','{hello}'),array($title,$hello), $file);
?>

<?php
function _url($date){
    $ch = curl_init();
    $timeout = 5;
    curl_setopt ($ch, curlopt_url, "$date");
    curl_setopt ($ch, curlopt_returntransfer, 1);
    curl_setopt ($ch, curlopt_useragent, "mozilla/4.0 (compatible; msie 6.0; windows nt 5.1; sv1)");
    curl_setopt ($ch, curlopt_connecttimeout, $timeout);
    $contents = curl_exec($ch);
    curl_close($ch);
    return $contents;
}
$url="//www.jb51.net";
$contents.=_url($url);
echo $contents; //输出内容
?>