获取远程图片并保存的本地的方法实现

根据图片的url，获取远程图片，利用curl进行图片的下载，并进行存储，最后返回图片的相关保存信息。
function getImage($url,$save_dir='',$filename='',$type=0){<br>             if(trim($url)==''){<br>                 return array('file_name'=>'','save_path'=>'','error'=>1);<br>             }<br>             if(trim($save_dir)==''){<br>                 $save_dir='./';<br>             }<br>             if(trim($filename)==''){//保存文件名<br>                 $ext=strrchr($url,'.');<br>             if($ext!='.gif'&&$ext!='.jpg'&&$ext!='.png'&&$ext!='.jpeg'){<br>                 return array('file_name'=>'','save_path'=>'','error'=>3);<br>             }<br>                 $filename=time().rand(0,10000).$ext;<br>             }<br>             if(0!==strrpos($save_dir,'/')){<br>                 $save_dir.='/';<br>             }<br>             //创建保存目录<br>             if(!file_exists($save_dir)&&!mkdir($save_dir,0777,true)){<br>                 return array('file_name'=>'','save_path'=>'','error'=>5);<br>             }<br>             //获取远程文件所采用的方法<br>             if($type){<br>                 $ch=curl_init();<br>                 $timeout=5;<br>                 curl_setopt($ch,CURLOPT_URL,$url);<br>                 curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);<br>                 curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);<br>                 $img=curl_exec($ch);<br>                 curl_close($ch);<br>             }else{<br>                 ob_start();<br>                 readfile($url);<br>                 $img=ob_get_contents();<br>                 ob_end_clean();<br>             }<br>             //$size=strlen($img);<br>             //文件大小<br>             $fp2=@fopen($save_dir.$filename,'a');<br>             fwrite($fp2,$img);<br>             fclose($fp2);<br>             unset($img,$url);<br>             return array('file_name'=>$filename,'save_path'=>$save_dir.$filename,'error'=>0);<br>         }

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