How to crawl Web images in PHP

Last Update:2017-02-27 Source: Internet

Author: User

Tags foreach curl time limit

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

PHP is a very easy to get started Web programming language. PHP is a very low learning cost, can quickly develop a variety of Web applications, is a very good tool.

Although many people find php a lot of disadvantages, such as quick and dirty, "there are only two programming languages in the world, one is controversial and one is useless", isn't it? As long as the tools to do things well, is a good tool. PHP is such a good language tool.

01.<?php
02.header (' Content-type:text/html;charset=utf-8 ');
Set_time_limit (0);//Crawl not subject to time limit
if ($_post[' Submit ']== "Start crawling") {
$URL =$_post[' link '];
Get_pic ($URL);
07.}
function Get_pic ($pic _url) {
09.//Get Picture binary stream
$data =curlget ($pic _url);
11.//Using regular expressions to get picture links
$pattern _src1 = '//'//images only in JPG format
$pattern _src2 = '//'//images only in BMP format
$pattern _src3 = '//'//Picture only in PNG format
$pattern _SRC4 = '//'//Only matches a picture in GIF format
$num 1 = preg_match_all ($pattern _src1, $data, $match _src1);
$num 2 = Preg_match_all ($pattern _src2, $data, $match _src2);
$num 3 = Preg_match_all ($pattern _src3, $data, $match _src3);
$num 4 = Preg_match_all ($pattern _src4, $data, $match _SRC4);
$arr _src1= $match _src1[1];//get an array of pictures
$arr _src2= $match _src2[1];
$arr _src3= $match _src3[1];
$arr _src4= $match _src4[1];
Echo ' ============================================= crawl start =============================================<br/ > ';
Get_name1 ($arr _src1);
Get_name1 ($arr _src2);
Get_name1 ($arr _src3);
Get_name1 ($arr _SRC4);
Get_name2 ($arr _src1);
Get_name2 ($arr _src2);
Get_name2 ($arr _src3);
Get_name2 ($arr _SRC4);
33.
Echo ' ============================================= crawl end =============================================<br/ > ';
return 0;
36.}
37.
function get_name1 ($pic _arr) {
39.//Picture number and type
$pattern _type = '/.*\/(. *?) $/';
41.
foreach ($pic _arr as $pic _item) {//loop out the address of each picture
$num = Preg_match_all ($pattern _type, $pic _item, $match _type);
44.//Save Picture as Stream
$write _fd = @fopen ($match _type[1][0], "WB");
Image URL: <a href= ' ". $pic _item." ' target= ' _blank ' > '. $pic _item. " </a><br/> ";
@fwrite ($write _fd, Curlget ($pic _item));
@fclose ($write _fd);
49.}
return 0;
51.}
function get_name2 ($pic _arr) {
53.//Picture number and type
$pattern _type = '/.*\/(. *?) $/';
55.
foreach ($pic _arr as $pic _item) {//loop out the address of each picture
$num = Preg_match_all ($pattern _type, $pic _item, $match _type);
58.//Save Picture as Stream
$write _fd = @fopen ($match _type[1][0], "WB");
echo "Image URL: <a href= '". $_post[' link '. $pic _item. "' target= ' _blank ' >". $_post[' link ']. $pic _item. " </a><br/> ";
@fwrite ($write _fd, curlget ($_post[' link '). $pic _item));
@fclose ($write _fd);
63.}
return 0;
65.}
66.//Crawl Web content
function Curlget ($url) {
$url =str_replace (' & ', ' & ', $url);
$curl = Curl_init ();
curl_setopt ($curl, Curlopt_url, $url);
curl_setopt ($curl, Curlopt_header, false);
72.
//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);
Bayi. return $values;
82.}
83.?>
84.<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title> Web Image Capture </title>
<body>
<form action= "" method= "POST" >
91. To crawl the image of the URL: <input type= "text" id= "link" name= "link" value= "Please enter here to capture the image URL" onclick= "this.value=" "" size= "100"/& Gt;<br/>
<input type= "Submit" id= "submit" name= "Submit" value= "Start crawling"/>
</form>
</body>
95. 
See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/webkf/PHP/

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More