This article mainly introduces the relevant information on how to efficiently obtain the size and size of remote images in PHP. I hope that through this article everyone can realize such a function. Friends in need can refer to it
PHP How to efficiently obtain the size and size of remote images
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Implementation code:
/** * 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 '<pre class="brush:php;toolbar:false">'; $result = myGetImageSize('http://s6.mogujie.cn/b7/bao/120630/2kpa6_kqywusdel5bfqrlwgfjeg5sckzsew_345x483.jpg_225x999.jpg', 'curl'); print_r($result); echo '<hr />'; $result = myGetImageSize('http://s5.mogujie.cn/b7/bao/120629/6d3or_kqytasdel5bgevsugfjeg5sckzsew_801x1193.jpg', 'fread'); print_r($result); echo '<hr />'; $result = myGetImageSize('http://hiphotos.baidu.com/zhengmingjiang/pic/item/1c5f338c6d22d797503d92f9.jpg', 'fread', true); print_r($result); echo '<hr />'; $result = myGetImageSize('http://www.vegandocumentary.com/wp-content/uploads/2009/01/imveganlogotransparentbackground.png', 'curl', true); print_r($result);
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