PHP下载远程图片的几种方法总结
微wx笑2019-09-04 14:03:50【编程语言】人已围观关键字：
php
PHP下载远程图片的几种方法总结1、使用file_get_contentsfunction dlfile($file_url, $save_to){ $content = file_get_contents($file_url); file_put_contents($save_to,
PHP下载远程图片的几种方法总结
1、使用file_get_contents
function dlfile($file_url, $save_to)
{
$content = file_get_contents($file_url);
file_put_contents($save_to, $content);
}2、使用CURL
function dlfile($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);
}3、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);
}4、使用readfile
参考：
/**
* 拉取远程图片
* @return mixed
*/
private function saveRemote()
{
$imgUrl = htmlspecialchars($this->fileField);
$imgUrl = str_replace("&", "&", $imgUrl);
//http开头验证
if (strpos($imgUrl, "http") !== 0) {
$this->stateInfo = $this->getStateInfo("ERROR_HTTP_LINK");
return;
}
preg_match('/(^https*:\/\/[^:\/]+)/', $imgUrl, $matches);
$host_with_protocol = count($matches) > 1 ? $matches[1] : '';
// 判断是否是合法 url
if (!filter_var($host_with_protocol, FILTER_VALIDATE_URL)) {
$this->stateInfo = $this->getStateInfo("INVALID_URL");
return;
}
preg_match('/^https*:\/\/(.+)/', $host_with_protocol, $matches);
$host_without_protocol = count($matches) > 1 ? $matches[1] : '';
// 此时提取出来的可能是 ip 也有可能是域名，先获取 ip
$ip = gethostbyname($host_without_protocol);
// 判断是否是私有 ip
if(!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE)) {
$this->stateInfo = $this->getStateInfo("INVALID_IP");
return;
}
//获取请求头并检测死链
$heads = get_headers($imgUrl, 1);
if (!(stristr($heads[0], "200") && stristr($heads[0], "OK"))) {
$this->stateInfo = $this->getStateInfo("ERROR_DEAD_LINK");
return;
}
//格式验证(扩展名验证和Content-Type验证)
$fileType = strtolower(strrchr($imgUrl, '.'));
if (strpos($fileType, "?")){
$fileType = strstr($fileType, "?", true);
}
if (!isset($heads['Content-Type']) || !stristr($heads['Content-Type'], "image")) {
$this->stateInfo = $this->getStateInfo("ERROR_HTTP_CONTENTTYPE");
return;
}else{
if (count($this->config['allowFiles']) > 0){
if (!in_array($fileType, $this->config['allowFiles'])){
//$this->stateInfo = $this->getStateInfo("ERROR_HTTP_ALLOWFILES").$heads['Content-Type']; //image/webp
return;
}
}
}
//打开输出缓冲区并获取远程图片
ob_start();
$context = stream_context_create(
array('http' => array(
'follow_location' => false // don't follow redirects
))
);
readfile($imgUrl, false, $context);
$img = ob_get_contents();
ob_end_clean();
$imgUrl2 = $imgUrl;
if (strpos($imgUrl, "?")){
$imgUrl2 = substr($imgUrl, 0, strripos($imgUrl, "?"));
}
preg_match("/[\/]([^\/]*)[\.]?[^\.\/]*$/", $imgUrl2, $m);
$this->oriName = $m ? $m[1]:"";
$this->fileSize = strlen($img);
$this->fileType = $this->getFileExt();
$this->fullName = $this->getFullName();
$this->filePath = $this->getFilePath();
$this->fileName = $this->getFileName();
$dirname = dirname($this->filePath);
//检查文件大小是否超出限制
if (!$this->checkSize()) {
$this->stateInfo = $this->getStateInfo("ERROR_SIZE_EXCEED");
return;
}
//创建目录失败
if (!file_exists($dirname) && !mkdir($dirname, 0777, true)) {
$this->stateInfo = $this->getStateInfo("ERROR_CREATE_DIR");
return;
} else if (!is_writeable($dirname)) {
$this->stateInfo = $this->getStateInfo("ERROR_DIR_NOT_WRITEABLE");
return;
}
//移动文件
if (!(file_put_contents($this->filePath, $img) && file_exists($this->filePath))) { //移动失败
$this->stateInfo = $this->getStateInfo("ERROR_WRITE_CONTENT");
} else { //移动成功
$this->stateInfo = $this->stateMap[0];
}
}下载与保存完整方法：
private function downloadImage($url)
{
$ch = curl_init();
curl_setopt($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, $file);
}
private function saveAsImage($url, $file)
{
$filename = pathinfo($url, PATHINFO_BASENAME);
$dirname = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_DIRNAME);
$path = 'public' . $dirname . '/';
$fullpath = 'public' . $dirname . '/' . $filename;
// 如果目录不存在，则创建
if(!is_dir($path)) {
mkdir($path, 0777, true);
}
if(file_exists($fullpath)) {
//$this->output->writeln("【已存在】输出路径" . $fullpath);
} else {
$resource = fopen($fullpath, 'a');
fwrite($resource, $file);
fclose($resource);
//$this->output->writeln("【已保存】输出路径" . $fullpath);
}
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