时间:2021-07-01 10:21:17 帮助过:3人阅读
1.使用 curl
比如我们有下面这两张图片:
$images = [ 'https://dn-laravist.qbox.me/2015-09-22_00-17-06j.png', 'https://dn-laravist.qbox.me/2015-09-23_00-58-03j.png' ];
第一步,我们可以直接来使用最简单的代码实现:
function download($url, $path = 'images/')
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_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);
}那在下载远程图片的时候就可以这样:
foreach ( $images as $url ) {
download($url);
}2.封装一个类
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_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);
}
}在者,我们还可以这样稍微优化一下:
public function downloadImage($url, $path='images/')
{
$ch = curl_init();
curl_setopt($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,对付基本的远程图片下载就OK了。
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