PHP如何通过URL实现图片下载操作？

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phpfunction imagefromURL($image, $rename) { $ch=curl_init($image); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1); $rawdata=curl_exec($ch); curl_close($ch); $fp=fopen($rename, wb);}

function imagefromURL($image,$rename) { $ch = curl_init($image); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_BINARYTRANSFER,1); $rawdata=curl_exec ($ch); curl_close ($ch); $fp = fopen("$rename",'w'); fwrite($fp, $rawdata); fclose($fp); }
用法：

<?php $url = "koonk.com/images/logo.png"; $rename = "koonk.png"; imagefromURL($url,$rename); ?>