PHP编程：php抓取并保存网站图片的实现代码

PHP教程
<?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)).*?>/'; 
 $ret = preg_match_all($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 = ""; 
 $img_url = get_img_url($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(); 
?>