首页 > 程序开发 > PHP > 让php获取图片的exif信息
2014
12-06

让php获取图片的exif信息

生产环境中,我们有业务上的需求,比如搞什么摄影网站,或者相册图集功能。用户上传的图片我们不仅要满足用户上传图片的保存,还应该将一些专业的照片参数进行保存起来,这样在一些专业的图片网站上(比较摄影爱好者论坛)应该要分享这些相机型号、感光度、光圈、快门等等信息。

在默认的php版本中是没有对php_exif扩展的安装所以还需要我们针对服务器进行安装php-exif安装支持。
具体的检查你可以使用phpinfo()查看下是否存在exif组件项目,如果存在证明你的服务器已经安装了exif扩展,如果没有则安装之。

安装php_exif组件

如果您的是windows环境, 只需要打开注释

extension=php_mbstring.dll
extension=php_exif.dll      ; Must be after mbstring as it depends on it

linux环境要安装php_exif组件,首先我们还是要打开php源码安装文件夹中的ext/exif,命令如下(具体路径以你服务器实际地址为准)

cd /usr/local/src/php-5.4.8/ext/exif
 
/opt/php/bin/phpize
 
./configure --with-php-config=/opt/php/bin/php-config
  
make && make install

安装完毕之后,你需要将php_exif扩展添加到php.ini文件中

vi /opt/php/lib/php.ini
 
#找到extension列表中  添加一行  extension=exif.so

然后重启下php-fpm,再去phpinfo函数中查看下exif组件是否存在了。

使用exif获取照片信息

上个步骤就是在安装exif,下面我们来使用exif来获取照片信息,网络上面有一个很不错的类,我顺手把它们摘抄到这里了,已经做测试优化,直接使用是没有问题的。

<?php
 
error_reporting(0);
 
/**
* 获取图象信息的函数
*
* 一个全面获取图象信息的函数
*
* @access public
* @param string $img 图片路径
* @return array
*/
function GetImageInfoVal($ImageInfo,$val_arr) {
 $InfoVal = "未知";
 foreach($val_arr as $name=>$val) {
 if ($name==$ImageInfo) {
 $InfoVal = &$val;
 break;
 }
 }
 return $InfoVal;
}
function GetImageInfo($img) {
 $imgtype = array("", "GIF", "JPG", "PNG", "SWF", "PSD", "BMP", "TIFF(intel byte order)", "TIFF(motorola byte order)", "JPC", "JP2", "JPX", "JB2", "SWC", "IFF", "WBMP", "XBM");
 $Orientation = array("", "top left side", "top right side", "bottom right side", "bottom left side", "left side top", "right side top", "right side bottom", "left side bottom");
 $ResolutionUnit = array("", "", "英寸", "厘米");
 $YCbCrPositioning = array("", "the center of pixel array", "the datum point");
 $ExposureProgram = array("未定义", "手动", "标准程序", "光圈先决", "快门先决", "景深先决", "运动模式", "肖像模式", "风景模式");
 $MeteringMode_arr = array(
 "0" => "未知",
 "1" => "平均",
 "2" => "中央重点平均测光",
 "3" => "点测",
 "4" => "分区",
 "5" => "评估",
 "6" => "局部",
 "255" => "其他"
 );
 $Lightsource_arr = array(
 "0" => "未知",
 "1" => "日光",
 "2" => "荧光灯",
 "3" => "钨丝灯",
 "10" => "闪光灯",
 "17" => "标准灯光A",
 "18" => "标准灯光B",
 "19" => "标准灯光C",
 "20" => "D55",
 "21" => "D65",
 "22" => "D75",
 "255" => "其他"
 );
 $Flash_arr = array(
 "0" => "flash did not fire",
 "1" => "flash fired",
 "5" => "flash fired but strobe return light not detected",
 "7" => "flash fired and strobe return light detected",
 );
  
 $exif = exif_read_data ($img,"IFD0");
 if ($exif===false) {
 $new_img_info = array ("文件信息" => "没有图片EXIF信息");
 }else{
 $exif = exif_read_data ($img,0,true);
 $new_img_info = array (
 "文件信息" => "-----------------------------",
 "文件名" => $exif['FILE']['FileName'],
 "文件类型" => $imgtype[$exif['FILE']['FileType']],
 "文件格式" => $exif['FILE']['MimeType'],
 "文件大小" => $exif['FILE']['FileSize'],
 "时间戳" => date("Y-m-d H:i:s",$exif['FILE']['FileDateTime']),
 "图像信息" => "-----------------------------",
 "图片说明" => $exif['IFD0']['ImageDescription'],
 "制造商" => $exif['IFD0']['Make'],
 "型号" => $exif['IFD0']['Model'],
 "方向" => $Orientation[$exif['IFD0']['Orientation']],
 "水平分辨率" => $exif['IFD0']['XResolution'].$ResolutionUnit[$exif['IFD0']['ResolutionUnit']],
 "垂直分辨率" => $exif['IFD0']['YResolution'].$ResolutionUnit[$exif['IFD0']['ResolutionUnit']],
 "创建软件" => $exif['IFD0']['Software'],
 "修改时间" => $exif['IFD0']['DateTime'],
 "作者" => $exif['IFD0']['Artist'],
 "YCbCr位置控制" => $YCbCrPositioning[$exif['IFD0']['YCbCrPositioning']],
 "版权" => $exif['IFD0']['Copyright'],
 "摄影版权" => $exif['COMPUTED']['Copyright.Photographer'],
 "编辑版权" => $exif['COMPUTED']['Copyright.Editor'],
 "拍摄信息" => "-----------------------------",
 "Exif版本" => $exif['EXIF']['ExifVersion'],
 "FlashPix版本" => "Ver. ".number_format($exif['EXIF']['FlashPixVersion']/100,2),
 "拍摄时间" => $exif['EXIF']['DateTimeOriginal'],
 "数字化时间" => $exif['EXIF']['DateTimeDigitized'],
 "拍摄分辨率高" => $exif['COMPUTED']['Height'],
 "拍摄分辨率宽" => $exif['COMPUTED']['Width'],
 /*
 The actual aperture value of lens when the image was taken.
 Unit is APEX.
 To convert this value to ordinary F-number(F-stop),
 calculate this value's power of root 2 (=1.4142).
 For example, if the ApertureValue is '5', F-number is pow(1.41425,5) = F5.6.
 */
 "光圈" => $exif['EXIF']['ApertureValue'],
 "快门速度" => $exif['EXIF']['ShutterSpeedValue'],
 "快门光圈" => $exif['COMPUTED']['ApertureFNumber'],
 "最大光圈值" => "F".$exif['EXIF']['MaxApertureValue'],
 "曝光时间" => $exif['EXIF']['ExposureTime'],
 "F-Number" => $exif['EXIF']['FNumber'],
 "测光模式" => GetImageInfoVal($exif['EXIF']['MeteringMode'],$MeteringMode_arr),
 "光源" => GetImageInfoVal($exif['EXIF']['LightSource'], $Lightsource_arr),
 "闪光灯" => GetImageInfoVal($exif['EXIF']['Flash'], $Flash_arr),
 "曝光模式" => ($exif['EXIF']['ExposureMode']==1?"手动":"自动"),
 "白平衡" => ($exif['EXIF']['WhiteBalance']==1?"手动":"自动"),
 "曝光程序" => $ExposureProgram[$exif['EXIF']['ExposureProgram']],
 /*
 Brightness of taken subject, unit is APEX. To calculate Exposure(Ev) from BrigtnessValue(Bv), you must add SensitivityValue(Sv).
 Ev=Bv+Sv Sv=log((ISOSpeedRating/3.125),2)
 ISO100:Sv=5, ISO200:Sv=6, ISO400:Sv=7, ISO125:Sv=5.32.
 */
 "曝光补偿" => $exif['EXIF']['ExposureBiasValue']."EV",
 "ISO感光度" => $exif['EXIF']['ISOSpeedRatings'],
 "分量配置" => (bin2hex($exif['EXIF']['ComponentsConfiguration'])=="01020300"?"YCbCr":"RGB"),//'0x04,0x05,0x06,0x00'="RGB" '0x01,0x02,0x03,0x00'="YCbCr"
 "图像压缩率" => $exif['EXIF']['CompressedBitsPerPixel']."Bits/Pixel",
 "对焦距离" => $exif['COMPUTED']['FocusDistance']."m",
 "焦距" => $exif['EXIF']['FocalLength']."mm",
 "等价35mm焦距" => $exif['EXIF']['FocalLengthIn35mmFilm']."mm",
 /*
 Stores user comment. This tag allows to use two-byte character code or unicode. First 8 bytes describe the character code. 'JIS' is a Japanese character code (known as Kanji).
 '0x41,0x53,0x43,0x49,0x49,0x00,0x00,0x00':ASCII
 '0x4a,0x49,0x53,0x00,0x00,0x00,0x00,0x00':JIS
 '0x55,0x4e,0x49,0x43,0x4f,0x44,0x45,0x00':Unicode
 '0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00':Undefined
 */
 "用户注释编码" => $exif['COMPUTED']['UserCommentEncoding'],
 "用户注释" => $exif['COMPUTED']['UserComment'],
 "色彩空间" => ($exif['EXIF']['ColorSpace']==1?"sRGB":"Uncalibrated"),
 "Exif图像宽度" => $exif['EXIF']['ExifImageLength'],
 "Exif图像高度" => $exif['EXIF']['ExifImageWidth'],
 "文件来源" => (bin2hex($exif['EXIF']['FileSource'])==0x03?"digital still camera":"unknown"),
 "场景类型" => (bin2hex($exif['EXIF']['SceneType'])==0x01?"A directly photographed image":"unknown"),
 "缩略图文件格式" => $exif['COMPUTED']['Thumbnail.FileType'],
 "缩略图Mime格式" => $exif['COMPUTED']['Thumbnail.MimeType']
 );
 }
 return $new_img_info;
}
  
$innerhtml = "";
$exif = GetImageInfo($_GET['img']);
 
$innerhtml .= "<table>";
  
foreach($exif as $name=>$val) {
 $innerhtml .= "<tr><td>{$name}</td><td>{$val}</td></tr>";
}
  
$innerhtml .= "<tr><td colspan=\"2\">";
 
$innerhtml .= "</td></tr></table>";
?>
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>markdream.com</title>
<style>body{font-size:12px;}table{margin: 30px auto;}</style>
</head>
<body>
 
<?php echo $innerhtml;?>
</body>
</html>
最后编辑日期:
作者:uuling
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