PHP实现下载远程图片保存到本地的方法
1.使用 curl
比如我们有下面这两张图片：
$images = [
];
function download($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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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使用file_get_contents
function dlfile($file_url, $save_to)
{
$content = file_get_contents($file_url);
file_put_contents($save_to, $content);
}
使用CURL
function dlfile($file_url, $save_to)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 0);
curl_setopt($ch,CURLOPT_URL,$file_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$file_content = curl_exec($ch);
curl_close($ch);
$downloaded_file = fopen($save_to, 'w');
fwrite($downloaded_file, $file_content);
fclose($downloaded_file);
}
使用fopen
function dlfile($file_url, $save_to)
{
$in= fopen($file_url, "rb");
$out= fopen($save_to, "wb");
while ($chunk = fread($in,8192))
{
fwrite($out, $chunk, 8192);
}
fclose($in);
fclose($out);
}
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