php 爬取网站图片

<?php 
header("content-type:text/html;charset=utf-8"); 
/*完成网页内容捕获功能*/
function get_img_url($site_name){ 
    $site_fd = fopen($site_name, "r"); 
    $site_content = ""; 
    while (!feof($site_fd)){
        $site_content .= fread($site_fd, 1024); 
    }
    //如果乱码使用
    //$site_content=mb_convert_encoding($site_content, "UTF-8", "GBK");
    /*利用正则表达式得到图片链接*/
    $reg_tag = '/<img.*?"([^"]*(jpg|bmp|jpeg|gif)).*?>/'; 
    $ret = preg_match_all($reg_tag, $site_content, $match_result);
    fclose($site_fd); 
    return $match_result[1]; 
} 
  
/* 对图片链接进行修正 */
function revise_site($site_list, $base_site){
    foreach($site_list as $site_item){
        if(preg_match('/^http/', $site_item)){
            $return_list[] = $site_item; 
        }else{ 
            $return_list[] = $base_site."/".$site_item;
        } 
    }
    return $return_list; 
}
  
/*得到图片名字，并将其保存在指定位置*/
function get_pic_file($pic_url_array, $pos){
    $reg_tag = '/.*/(.*?)$/'; 
    $count = 0;
    foreach($pic_url_array as $pic_item){
        $ret = preg_match_all($reg_tag,$pic_item,$t_pic_name);
        $pic_name = $pos.$t_pic_name[1][0]; 
        $pic_url = $pic_item; 
        print("Downloading ".$pic_url." ");
        $img_read_fd = fopen($pic_url,"r");
        $img_write_fd = fopen($pic_name,"w");
        $img_content = "";
        while(!feof($img_read_fd)){
            $img_content .= fread($img_read_fd,1024);
        } 
        fwrite($img_write_fd,$img_content); 
        fclose($img_read_fd); 
        fclose($img_write_fd); 
        print("[OK] "); 
    } 
    return 0; 
} 
  
function main(){ 
    /* 待抓取图片的网页地址 */
    $site_name = "http://www.58pic.com/"; 
    $img_url = get_img_url($site_name); 
    $img_url_revised = revise_site($img_url, $site_name); 
    $img_url_unique = array_unique($img_url_revised); //unique array 
    get_pic_file($img_url_unique,"./"); 
} 
  
main();
?> 

原文地址   http://www.jb51.net/article/74032.htm

<?php
//过滤所有的img 
$url = "http://www.ivsky.com";
$str = file_get_contents($url);
$preg = '/<img[^>]*/>/';
preg_match_all($preg, $str, $matches);
$matches = $matches[0];
//获取src中的链接
$arr = [];
foreach($matches as $v){
    $preg = '///.*.jpg/';
    preg_match_all($preg, $v, $match);
    $arr[] = $match[0][0];
}
//文件保存地址
$dir = 'cdn/img';

foreach($arr as $k => $v){
    //图片名称
    $name = $dir . $k . '.jpg';
    //下载
    download($name, $v);
}
function download($name, $url){
    if(!is_dir(dirname($name))){
        mkdir(dirname($name));
    }
    $url = 'http:'.$url;
    $str = file_get_contents($url);
    file_put_contents($name, $str);
    //输出一些东西,要不窗口一直黑着,感觉怪怪的
    echo strlen($str);
    echo "
";
}