>我的攝影師朋友懇請我從Internet查找和下載圖像的圖像。最終，我降落在一個免費的網(wǎng)頁上，其中有很多免費，但存在一個問題：并不存在將所有圖像一起下載的鏈接。

>我不想經(jīng)歷單獨下載圖像的壓力，所以我寫了此PHP課程以查找，下載和zip在網(wǎng)站上找到的所有圖像。

鑰匙要點

• > PHP類利用Symfony的Domcrawler組件從網(wǎng)頁上刮擦圖像，下載并將其保存到文件夾中，創(chuàng)建文件夾的ZIP檔案，然后刪除文件夾。該課程旨在自動化從網(wǎng)站下載多個圖像的過程。
>
• 課程包括五個私人屬性和八種公共方法。屬性存儲信息，例如文件夾名稱，網(wǎng)頁URL，HTML文檔代碼，ZIP文件名和操作狀態(tài)。這些方法包括設置文件夾和文件名，實例化domcrawler，下載和保存圖像，創(chuàng)建zip文件，刪除文件夾并獲取操作狀態(tài)的函數(shù)。>
要使用類，必須通過自動加載或明確包含所有必需的文件。 SetFolder和setFilename方法應使用其各自的參數(shù)調(diào)用，然后調(diào)用過程方法使該類工作。必須包括domcrawler組件和create_zip函數(shù)以使類功能。
班級的工作方式

>它搜索圖像，下載并將圖像保存到文件夾中，創(chuàng)建文件夾的zip檔案，最后刪除文件夾。

>類使用Symfony的Domcrawler組件來搜索網(wǎng)頁上找到的所有圖像鏈接以及創(chuàng)建zip文件的自定義zip函數(shù)。借助David Walsh的ZIP功能。

編碼類

>該類包括五個私人屬性和八種公共方法，包括__ -Construct Magic方法。

下面的是類屬性及其角色的列表。

2。$ URL：存儲網(wǎng)頁URL。
3。$ html：存儲要刮擦的網(wǎng)頁的HTML文檔代碼。
4。$文件名：存儲zip文件的名稱。
5。$狀態(tài)：保存操作的狀態(tài)。即，如果是成功或失敗。
>
>讓我們開始建立課程。

創(chuàng)建包含上述五個屬性的類Zipimages。

<span><span><?php
</span></span><span><span>class ZipImages {
</span></span><span>    <span>private $folder;
</span></span><span>    <span>private $url;
</span></span><span>    <span>private $html;
</span></span><span>    <span>private $fileName;
</span></span><span>    <span>private $status;</span></span>

<span>public function __construct($url) {
</span>    <span>$this->url = $url; 
</span>    <span>$this->html = file_get_contents($this->url);
</span>    <span>$this->setFolder();
</span><span>}</span>

默認情況下，文件夾名稱設置為圖像，但是該方法提供了一個選項，可以通過簡單地將文件夾名稱作為其參數(shù)來更改文件夾的名稱。

<span><span><?php
</span></span><span><span>class ZipImages {
</span></span><span>    <span>private $folder;
</span></span><span>    <span>private $url;
</span></span><span>    <span>private $html;
</span></span><span>    <span>private $fileName;
</span></span><span>    <span>private $status;</span></span>

> setFileName提供了一個選項，可以將eftault名稱設置為zipimages更改zip文件的名稱：

<span>public function __construct($url) {
</span>    <span>$this->url = $url; 
</span>    <span>$this->html = file_get_contents($this->url);
</span>    <span>$this->setFolder();
</span><span>}</span>

<span>public function setFolder($folder="image") {
</span>    <span>// if folder doesn't exist, attempt to create one and store the folder name in property $folder
</span>    <span>if(!file_exists($folder)) {
</span>        <span>mkdir($folder);
</span>    <span>}
</span>    <span>$this->folder = $folder;
</span><span>}</span>

<span>public function setFileName($name = "zipImages") {
</span>    <span>$this->fileName = $name;
</span><span>}</span>

獲得操作的狀態(tài)。即，如果成功或發(fā)生錯誤。

<span>public function domCrawler() {
</span>    <span>//instantiate the symfony DomCrawler Component
</span>    <span>$crawler = new Crawler($this->html);
</span>    <span>// create an array of all scrapped image links
</span>    <span>$result = $crawler
</span>        <span>->filterXpath('//img')
</span>        <span>->extract(array('src'));
</span>
<span>// download and save the image to the folder 
</span>    <span>foreach ($result as $image) {
</span>        <span>$path = $this->folder."/".basename($image);
</span>        <span>$file = file_get_contents($image);
</span>        <span>$insert = file_put_contents($path, $file);
</span>        <span>if (!$insert) {
</span>            <span>throw new <span>\Exception</span>('Failed to write image');
</span>        <span>}
</span>    <span>}
</span><span>}</span>

處理上述所有方法。

<span>public function createZip() {
</span>    <span>$folderFiles = scandir($this->folder);
</span>    <span>if (!$folderFiles) {
</span>        <span>throw new <span>\Exception</span>('Failed to scan folder');
</span>    <span>}
</span>    <span>$fileArray = array();
</span>    <span>foreach($folderFiles as $file){
</span>        <span>if (($file != ".") && ($file != "..")) {
</span>            <span>$fileArray[] = $this->folder."/".$file;
</span>        <span>}
</span>    <span>}
</span>
    <span>if (create_zip($fileArray, $this->fileName.'.zip')) {
</span>        <span>$this->status = <span><span><<<HTML</span>
</span></span><span>File successfully archived. <a href="<span><span>$this->fileName</span>.zip">Download it now</a>
</span></span><span><span>HTML<span>;</span></span>
</span>    <span>} else {
</span>        <span>$this->status = "An error occurred";
</span>    <span>}
</span><span>}</span>

您可以從GitHub下載完整的課程。

<span>public function deleteCreatedFolder() {
</span>    <span>$dp = opendir($this->folder) or die ('ERROR: Cannot open directory');
</span>    <span>while ($file = readdir($dp)) {
</span>        <span>if ($file != '.' && $file != '..') {
</span>            <span>if (is_file("<span><span>$this->folder</span>/<span>$file</span>"</span>)) {
</span>                <span>unlink("<span><span>$this->folder</span>/<span>$file</span>"</span>);
</span>            <span>}
</span>        <span>}
</span>    <span>}
</span>    <span>rmdir($this->folder) or die ('could not delete folder');
</span><span>}</span>

<span>public function getStatus() {
</span>    <span>echo $this->status;
</span><span>}</span>

<span>public function process() {
</span>    <span>$this->domCrawler();
</span>    <span>$this->createZip();
</span>    <span>$this->deleteCreatedFolder();
</span>    <span>$this->getStatus();
</span><span>}</span>

以上是與Symfony的圖像刮擦的詳細內(nèi)容。更多信息請關注PHP中文網(wǎng)其他相關文章！