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);
	}
?>

实例：

<?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);
 
	}
?>

实例：

<?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);
	}
?>

实例：

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