php下载远程文件(图片)的三种方法

1. 使用file_get_contents 和 file_put_contents 方法下载远程图片：

<?php
function download_remote_file($file_url, $save_to)
{
$content = file_get_contents($file_url);
file_put_contents($save_to, $content);
}
?>

<?php
download_remote_file('http://www.54ux.com/wp-content/themes/d-simple/img/thumbnail.jpg', realpath("./downloads") . '/file.jpg');
?>

2.使用php CURL 下载远程图片

<?php
function download_remote_file_with_curl($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);

}
?>

<?php
download_remote_file_with_curl('http://www.54ux.com/wp-content/themes/d-simple/img/thumbnail.jpg', realpath("./downloads") . '/file.jpg');
?>

3. 使用 fopen 下载远程图片：

<?php
function download_remote_file_with_fopen($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);
}
?>

<?php
download_remote_file_with_fopen('http://www.54ux.com/wp-content/themes/d-simple/img/thumbnail.jpg', realpath("./downloads") . '/file.jpg');
?>