在使用 PHP 做简单的爬虫的时候，我们经常会遇到需要下载远程图片的需求，所以下面来简单实现这个需求
1:使用curl
比如我们有下面这两张图片：
$images = [ ???‘https://img.alicdn.com/tps/TB1jjaYOFXXXXa2aXXXXXXXXXXX-276-402.jpg_150x10000q90.jpg‘, ???‘https://img.alicdn.com/tfs/TB15QQ5cgMPMeJjy1XbXXcwxVXa-520-280.jpg_q90_.webp‘];
第一步，我们可以直接来使用最简单的代码实现：
function download($url, $path = ‘images/‘){ ???$ch = curl_init(); ???curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 信任任何证书 ???curl_setopt($ch, CURLOPT_URL, $url); ???curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); ???curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); ???$file = curl_exec($ch); ???curl_close($ch); ???$filename = pathinfo($url, PATHINFO_BASENAME); ???$resource = fopen($path . $filename, ‘a‘); ???fwrite($resource, $file); ???fclose($resource);}那么在下载远程图片的时候就可以这样：
foreach ( $images as $url ) { ???download($url);}1:封装成一个类
缕清思路之后，我们可以将这个基本的功能封装到一个类中：
class Spider { ???public function downloadImage($url, $path = ‘images/‘) ???{ ???????$ch = curl_init(); ???????curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 信任任何证书 ???????curl_setopt($ch, CURLOPT_URL, $url); ???????curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); ???????curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); ???????$file = curl_exec($ch); ???????curl_close($ch); ???????$filename = pathinfo($url, PATHINFO_BASENAME); ???????$resource = fopen($path . $filename, ‘a‘); ???????fwrite($resource, $file); ???????fclose($resource); ???}} ???或者，我们还可以这样稍微优化一下：
class Spider { ???public function downloadImage($url, $path=‘images/‘) ???{ ???????$ch = curl_init(); ???????curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 信任任何证书 ???????curl_setopt($ch, CURLOPT_URL, $url); ???????curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); ???????curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); ???????$file = curl_exec($ch); ???????curl_close($ch); ???????$this->saveAsImage($url, $file, $path); ???} ???private function saveAsImage($url, $file, $path) ???{ ???????$filename = pathinfo($url, PATHINFO_BASENAME); ???????$resource = fopen($path . $filename, ‘a‘); ???????fwrite($resource, $file); ???????fclose($resource); ???}} ???封装成类之后，我们可以这样调用代码来下载图片：
$spider = new Spider();foreach ( $images as $url ) { ???$spider->downloadImage($url);}这样，对一般可访问的远程图片下载就OK了....
php下载远程图片到本地
原文地址：http://www.cnblogs.com/phpper/p/7498110.html