php抓取并保存网站图片的实现代码,
php抓取并保存网站图片的实现代码,
此程序实现了网页源代码捕获,图片链接获取、分析、并将同样的图片链接合并功能,实现了图片抓取功能。利用php强大的网络内容处理函数将指定的网站上的所有图片抓取下来,保存在当前目录下,以下为代码:
<?php /*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); } /*利用正则表达式得到图片链接*/ $reg_tag = '/<img .*?\"([^\"]*(jpg|bmp|jpeg|gif)).*? alt="php抓取并保存网站图片的实现代码," >/'; $ret = preg_match_all($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.bkjia.com/sheying/391528.html"; $img_url = get_img_url($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(); ?>
此程序还有待完善的地方是,如果图片在网站服务器上不同目录下但文件名是相同的,此时图片有可能是不一样的,但在最后保存时,后面得到的图片会将前面已经保存的图片覆盖掉,解决方法是在每次保存前先检索当前目录下是否已有此文件名,有的话对将要保存的图片重新命名即可。
以上就是为大家分享的php抓取并保存网站图片的方法,以及在实践过程中修正程序不完善的地方,希望这篇文章对大家的学习有所帮助。

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