php获取图片完整名称,让php获取图片的exif信息

16 08 2014

让php获取图片的exif信息

Yinchiang | 1

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

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。

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 .= "

foreach($exif as $name=>$val) {

$innerhtml .= "

{$name}{$val}";

}

$innerhtml .= "

";

$innerhtml .= "

";

?>

markdream.com

演示demo

One thought on “让php获取图片的exif信息”

[…] 网上有个地址 http://www.markdream.com/technologies/programs/php-get-the-picture-exif-info.shtml 比较详细的说明了php获取exif 信息。这里6表示 right side top 。 […]

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