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    if ($url == '') { 
        return false; 
    } 
    $ext = strrchr($url, '.'); 
 
    if ($ext != '.gif' && $ext != '.jpg') { 
        return false; 
    } 
 
    //ÅжÏ·¾­ÊÇ·ñ´æÔÚ 
    !is_dir($filepath)?mkdir($filepath):null; 
 
    //»ñµÃËæ»úµÄͼƬÃû£¬²¢¼ÓÉϺóê¡Ãû 
    $filetime = time(); 
    $filename = date("ymdhis",$filetime).rand(100,999).'.'.substr($url,-3,3); 
 
    //¶ÁȡͼƬ 
    $img = file_get_contents($url); 
    //Ö¸¶¨´ò¿ªµÄÎļþ 
    $fp = @ fopen($filepath.'/'.$filename, 'a'); 
    //дÈëͼƬµ½Ö¸¶¨µÄÎı¾ 
    fwrite($fp, $img); 
    fclose($fp); 
    return '/'.$filepath.'/'.$filename; 
}
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