php正则表达式之正则字符中的图片地址

<?php
/*
author: ssh_kobe
date: 20110602
shortage: 如果网页中的图片路径不是绝对路径，就无法抓取
*/
set_time_limit(0);//抓取不受时间限制

$URL='http://pp.baidu.com/';//任意网址

get_pic($URL);

function get_pic($pic_url) {
//获取图片二进制流
$data=CurlGet($pic_url);
/*利用正则表达式得到图片链接*/
$pattern_src = '/<[img|IMG].*?src=['|"](.*?(?:[.gif|.jpg]))['|"].*?[/]?>/';
$num = preg_match_all($pattern_src, $data, $match_src);
$arr_src=$match_src[1];//获得图片数组
get_name($arr_src);

echo "<br>finished!!!";
return 0;
}

/*得到图片类型，并将其保存到与该文件同一目录*/
function get_name($pic_arr)
{
//图片类型
$pattern_type = '/(/.(jpg|bmp|jpeg|gif|png))/';

foreach($pic_arr as $pic_item){//循环取出每幅图的地址
$num = preg_match_all($pattern_type, $pic_item, $match_type);
$pic_name = get_unique().$match_type[1][0];//改时微秒时间戳命名
//以流的形式保存图片
$write_fd = @fopen($pic_name,"wb");
@fwrite($write_fd, CurlGet($pic_item));
@fclose($write_fd);
echo "[OK]..!";
}
return 0;
}

//通过微秒时间获得唯一ID
function get_unique(){
list($msec, $sec) = explode(" ",microtime());
return $sec.intval($msec*1000000);
}

//抓取网页内容
function CurlGet($url){
$url=str_replace('&','&',$url);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_HEADER, false);

//curl_setopt($curl, CURLOPT_REFERER,$url);
curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; SeaPort/1.2; Windows NT 5.1; SV1; InfoPath.2)");
curl_setopt($curl, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt($curl, CURLOPT_COOKIEFILE, 'cookie.txt');
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 0);
$values = curl_exec($curl);
curl_close($curl);
return $values;
}
?>

<?php
$a =array(100,80,50,10,0);
$b = array("c","f","q","e","z");
array_multisort($a,$b);
var_dump($a);
var_dump($b);
?>

运行结果：
array(5) { [0]=> int(0) [1]=> int(10) [2]=> int(50) [3]=> int(80) [4]=> int(100) }
array(5) { [0]=> string(1) “z” [1]=> string(1) “e” [2]=> string(1) “q” [3]=> string(1) “f” [4]=> string(1) “c” }

 <?php
$array[] = array("age"=>20,"name"=>"li");
$array[] = array("age"=>21,"name"=>"ai");
$array[] = array("age"=>20,"name"=>"ci");
$array[] = array("age"=>22,"name"=>"di");
 
foreach ($array as $key=>$value){
 $age[$key] = $value['age'];
 $name[$key] = $value['name'];
}
 
array_multisort($age,SORT_NUMERIC,SORT_DESC,$name,SORT_STRING,SORT_ASC,$array);
print_r($array);
?>

<?php

// 说明：用 array_map() 调用 mysql_real_escape_string 清理数组

// 整理：http://www.111cn.net

function mysqlClean($data)

{

return (is_array($data))?array_map('mysqlClean', $data):mysql_real_escape_string($data);

}

?>

<?php

$conn = mysql_connect('localhost', 'user', 'pass');
$_POST = mysqlClean($_POST);

?>

<?php

// 说明：用 mysql_real_escape_string 清洁并限制字符长度

// 整理：http://www.111cn.net

function mysqlClean($array, $index, $maxlength)

{

if (isset($array[$index]))

{

$input = substr($array["{$index}"], 0, $maxlength);

$input = mysql_real_escape_string($input);

return ($input);

}

return NULL;

}

?>

<?php

$conn = mysql_connect('localhost', 'user', 'pass');

if(isset($_POST['username']))

{

$_POST['username'] = mysqlClean($_POST, 'username', 20);

echo $_POST['username'];

}

?>