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PHP efficiently obtains remote image size and size

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2016-07-25 09:12:281143browse

/*** 
获取远程图片的宽高和体积大小
** @param string $url 远程图片的链接
* @param string $type 获取远程图片资源的方式, 默认为 curl 可选 fread
* @param boolean $isGetFilesize 是否获取远程图片的体积大小, 默认false不获取, 设置为 true 时 $type 将强制为 fread
* @return false|array*/
function myGetImageSize($url, $type = 'curl', $isGetFilesize = false){// 若需要获取图片体积大小则默认使用 
fread 方式$type = $isGetFilesize ? 'fread' : $type;if ($type == 'fread') 
{// 或者使用 socket 二进制方式读取, 需要获取图片体积大小最好使用此方法$handle = fopen($url, 'rb');
if (! $handle) return false;// 只取头部固定长度168字节数据
$dataBlock = fread($handle, 168);
}else 
{// 据说 CURL 能缓存DNS 效率比 socket 高
$ch = curl_init($url);// 超时设置
curl_setopt($ch, CURLOPT_TIMEOUT, 5);// 取前面 168 个字符 
通过四张测试图读取宽高结果都没有问题,若获取不到数据可适当加大数值
curl_setopt($ch, CURLOPT_RANGE, '0-167');// 跟踪301跳转
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);// 返回结果
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$dataBlock = curl_exec($ch);
curl_close($ch);
if (! $dataBlock) return false;
}
// 将读取的图片信息转化为图片路径并获取图片信息,经测试,这里的转化设置 jpeg 对获取png,gif的信息没有影响,
无须分别设置
// 有些图片虽然可以在浏览器查看但实际已被损坏可能无法解析信息
$size = getimagesize('data://image/jpeg;base64,'. base64_encode($dataBlock));
if (empty($size)) 
{return false;
}
$result['width'] = $size[0];$result['height'] = $size[1];// 是否获取图片体积大小if ($isGetFilesize) 
{// 获取文件数据流信息$meta = stream_get_meta_data($handle);
// nginx 的信息保存在 headers 里,apache 则直接在 wrapper_data
$dataInfo = isset($meta['wrapper_data']['headers']) ? $meta['wrapper_data']['headers'] : 
$meta['wrapper_data'];foreach ($dataInfo as $va) 
{
if ( preg_match('/length/iU', $va)) 
{$ts = explode(':', $va);$result['size'] = trim(array_pop($ts));
break;
}
}
}
if ($type == 'fread') 
fclose($handle);
return 
$result;
}
// 测试的图片链接
echo '';
$result = myGetImageSize
('http://s6.mogujie.cn/b7/bao/120630/2kpa6_kqywusdel5bfqrlwgfjeg5sckzsew_345x483.jpg_225x999.jpg', 'curl');
print_r($result);
echo '';
$result = myGetImageSize
('http://s5.mogujie.cn/b7/bao/120629/6d3or_kqytasdel5bgevsugfjeg5sckzsew_801x1193.jpg', 'fread');
print_r($result);
echo '';
$result = myGetImageSize
('http://hiphotos.baidu.com/zhengmingjiang/pic/item/1c5f338c6d22d797503d92f9.jpg', 'fread', true);
print_r($result);
echo '';
$result = myGetImageSize
('http://www.vegandocumentary.com/wp-content/uploads/2009/01/imveganlogotransparentbackground.png', 'curl', 
true);
print_r($result);
echo '';
$result = myGetImageSize
('http://jiaoyou.ai9475.com/front/templates/jiaoyou/styles/default/image/ad_pic_1.gif', 'fread');
print_r($result);

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