php获取图片完整Exif信息类 获取图片详细完整信息类
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首先解释一下什么是Exif。Exif是一种图象文件格式，它的数据存储与JPEG格式是完全相同的。实际上，Exif格式就是在JPEG格式头部插入了数码照片的信息，包括拍摄时的光圈、快门、白平衡、ISO、焦距、日期时间等各种和拍摄条件以及相机品牌、型号、色彩编码、拍摄时录制的声音以及全球定位系统（GPS）、缩略图等。简单地说，Exif=JPEG+拍摄参数。因此，你可以利用任何可以查看JPEG文件的看图软件浏览Exif格式的照片，但并不是所有的图形程序都能处理Exif信息。
- 开启php模块
默认情况下，PHP读取图片Exif信息模块是不开启的，我们需要先开启这个模块。
开启Exif模块需要mbstring支持，所以先安装mbstring（此处步骤省略，和服务器的环境有关），然后安装exif模块（此处步骤同样省略，和服务器的环境有关）。
在php.ini中添加模块，打开php.ini添加以下两行
extension = "mbstring.so"extension = "exif.so"
并且确认extension_dir值与你安装模块时提示的Installingshared extensions值一致，保存php.ini，重启webserver
2.读取图片Exif信息
支持读取exif信息的图片类型在phpinfo里已经写明了，只能是jpeg或者tiff类型，其中jpeg是常用类型，这就已经足够。
<?php
/**
* @Author: TonyLevid
* @Copyright: TonyLevid.com
* @Name: Image Exif Class
* @Version: 0.0.1
* 欢迎各位测试，如有BUG，请到网站留言
* I‘m pleased if you are willing to test my Image Exif class,if bug exists,you can leave a message.
**/
//error_reporting(0); 不想让用户看到错误如果存在bug
header("content-type:text/html;charset=utf-8"); //如果在html页面已经设置编码，请删除此行
class imgExif{
public $imgPath;
public $unitFlag;
public $imgInfoAll;
public $imgInfoAllCN;
public $imgInfoCommon;
public $imgInfoBrief;
public $imgInfoAllCNUnit;
/*构造函数，检测exif和mbstring模块是否开启*/
function __construct(){
extension_loaded(‘exif‘)&&extension_loaded(‘mbstring‘) or
die(‘exif module was not loaded,please check it in php.ini<br>NOTICE:On Windows,php_mbstring.dll must be before php_exif.dll‘);
}
/*获取图片格式，返回图片格式信息
* 如果只获取图片格式信息，建议采用此方法
*
* @param $imgPath(必填,字符串)，图片路径，不可为url。
* @param $MimeOrExifOrExtension(可选,字符串)，获取图片格式为Mime类型或Exif类型或图片类型文件后缀。
* 如果为字符串‘Mime‘，则获取Mime图片类型。
* 如果为字符串‘Exif‘，则获取Exif图片类型。
* 如果为字符串‘Extension‘，则获取图片类型的文件后缀。
* 如果填写参数异常或缺省，则默认获取Mime图片类型。
*/
function getImgtype($imgPath,$MimeOrExifOrExtension = null){
$exifImgtype = array(
‘IMAGETYPE_GIF‘ => 1,
‘IMAGETYPE_JPEG‘ => 2,
‘IMAGETYPE_PNG‘ => 3,
‘IMAGETYPE_SWF‘ => 4,
‘IMAGETYPE_PSD‘ => 5,
‘IMAGETYPE_BMP‘ => 6,
‘IMAGETYPE_TIFF_II‘ => 7, //（Intel 字节顺序）
‘IMAGETYPE_TIFF_MM‘ => 8, //（Motorola 字节顺序）
‘IMAGETYPE_JPC‘ => 9,
‘IMAGETYPE_JP2‘ => 10,
‘IMAGETYPE_JPX‘ => 11,
‘IMAGETYPE_JB2‘ => 12,
‘IMAGETYPE_SWC‘ => 13,
‘IMAGETYPE_IFF‘ => 14,
‘IMAGETYPE_WBMP‘ => 15,
‘IMAGETYPE_XBM‘ => 16
);
$exifType = array_search(exif_imagetype($imgPath),$exifImgtype);
$mimeType = image_type_to_mime_type(exif_imagetype($imgPath));
$extension = substr(image_type_to_extension(exif_imagetype($imgPath)),1);
if($MimeOrExifOrExtension){
if($MimeOrExifOrExtension === ‘Mime‘){
return $mimeType;
}
elseif($MimeOrExifOrExtension === ‘Exif‘){
return $exifType;
}
elseif($MimeOrExifOrExtension === ‘Extension‘){
return $extension;
}
else{
return $mimeType;
}
}
else{
return $mimeType;
}
}
/*处理Exif信息*/
function imgInfo(){
$imgPath = $this->imgPath;
$imgInfoAll = exif_read_data($imgPath,0,1);
foreach($imgInfoAll as $section => $arrValue){
foreach($arrValue as $key => $value){
$infoAllKey[] = $key;
$infoAllValue[] = $value;
}
}
$infoAll = array_combine($infoAllKey,$infoAllValue);
$translate = array(
‘FileName‘=>‘文件名‘,
‘FileDateTime‘ => ‘文件修改时间‘,
‘FileSize‘ => ‘文件大小‘,
‘FileType‘ => ‘Exif文件类型‘,
‘MimeType‘ => ‘Mime文件类型‘,
‘SectionsFound‘ => ‘找到Sections‘,
‘html‘ => ‘html中图片宽高‘,
‘Height‘ => ‘图片高度‘,
‘Width‘ => ‘图片宽度‘,
‘IsColor‘ => ‘是否彩色‘,
‘ByteOrderMotorola‘ => ‘是否为Motorola字节顺序‘,
‘ApertureFNumber‘ => ‘光圈数‘,
‘Comments‘ => ‘作者注释‘,
‘Author‘ => ‘作者‘,
‘UserComment‘ => ‘用户注释‘,
‘UserCommentEncoding‘ => ‘用户注释编码‘,
‘Thumbnail.FileType‘ => ‘缩略图Exif文件类型‘,
‘Thumbnail.MimeType‘ => ‘缩略图Mime文件类型‘,
‘Make‘ => ‘制造商‘,
‘Model‘ => ‘型号‘,
‘Orientation‘ => ‘方向‘,
‘XResolution‘ => ‘水平分辨率‘,
‘YResolution‘ => ‘垂直分辨率‘,
‘ResolutionUnit‘ => ‘分辨率单位‘,
‘Software‘ => ‘创建软件‘,
‘DateTime‘ => ‘最后修改时间‘,
‘YCbCrPositioning‘ => ‘YCbCr位置控制‘,
‘Exif_IFD_Pointer‘ => ‘Exif图像IFD的指针‘,
‘Compression‘ => ‘压缩方式‘,
‘JPEGInterchangeFormat‘ => ‘JPEG SOI偏移‘,
‘JPEGInterchangeFormatLength‘ => ‘JPEG数据字节‘,
‘ExposureTime‘ => ‘曝光时间‘,
‘FNumber‘ => ‘焦距比数‘,
‘ExposureProgram‘ => ‘曝光程序‘,
‘ISOSpeedRatings‘ => ‘ISO感光度‘,
‘ExifVersion‘ => ‘Exif版本‘,
‘DateTimeOriginal‘ => ‘拍摄时间‘,
‘DateTimeDigitized‘ => ‘数字化时间‘,
‘ComponentsConfiguration‘ => ‘分量配置‘,
‘CompressedBitsPerPixel‘ => ‘图像压缩率‘,
‘ExposureBiasValue‘ => ‘曝光补偿‘,
‘MaxApertureValue‘ => ‘最大光圈值‘,
‘MeteringMode‘ => ‘测光模式‘,
‘LightSource‘ => ‘光源‘,
‘Flash‘ => ‘闪光灯‘,
‘FocalLength‘ => ‘焦距‘,
‘SubSecTime‘ => ‘亚秒时间‘,
‘SubSecTimeOriginal‘ => ‘亚秒级拍摄时间‘,
‘SubSecTimeDigitized‘ => ‘亚秒级数字化时间‘,
‘FlashPixVersion‘ => ‘FlashPix版本‘,
‘ColorSpace‘ => ‘色彩空间‘,
‘ExifImageWidth‘ => ‘Exif图片宽度‘,
‘ExifImageLength‘ => ‘EXif图片高度‘,
‘InteroperabilityOffset‘ => ‘IFD格式数据偏移量‘,
‘SensingMethod‘ => ‘彩色区域传感器类型‘,
‘FileSource‘ => ‘图片像源‘,
‘SceneType‘ => ‘场景类型‘,
‘CFAPattern‘ => ‘滤波阵列图案‘,
‘CustomRendered‘ => ‘自定义图像处理‘,
‘ExposureMode‘ => ‘曝光模式‘,
‘WhiteBalance‘ => ‘白平衡‘,
‘DigitalZoomRatio‘ => ‘数位变焦倍率‘,
‘FocalLengthIn35mmFilm‘ => ‘等价35mm焦距‘,
‘SceneCaptureType‘ => ‘取景模式‘,
‘GainControl‘ => ‘增益控制‘,
‘Contrast‘ => ‘对比度‘,
‘Saturation‘ => ‘饱和度‘,
‘Sharpness‘ => ‘清晰度‘,
‘SubjectDistanceRange‘ => ‘对焦距离‘,
‘InterOperabilityIndex‘ => ‘InterOperability指数‘,
‘InterOperabilityVersion‘ => ‘InterOperability版本‘
);
@$translate_unit = array(
‘文件名‘ => $infoAll[‘FileName‘],
‘文件修改时间‘ => date(‘Y:m:d H:i:s‘,$infoAll[‘FileDateTime‘]),
‘文件大小‘ => round($infoAll[‘FileSize‘]/1024) . ‘kb‘,
‘Exif文件类型‘ => $this->getImgtype($imgPath,‘Exif‘),
‘Mime文件类型‘ => $infoAll[‘MimeType‘],
‘找到Sections‘ => $infoAll[‘SectionsFound‘],
‘html中图片宽高‘ => $infoAll[‘html‘],
‘图片高度‘ => $infoAll[‘Height‘] . ‘px‘,
‘图片宽度‘ => $infoAll[‘Width‘] . ‘px‘,
‘是否彩色‘ => $infoAll[‘IsColor‘] == 1 ? ‘是‘ : ‘否‘,
‘是否为Motorola字节顺序‘ => $infoAll[‘ByteOrderMotorola‘] == 1 ? ‘是‘ : ‘否‘,
‘光圈数‘ => $infoAll[‘ApertureFNumber‘],
‘作者注释‘ => $infoAll[‘Comments‘],
‘作者‘ => $infoAll[‘Author‘],
‘用户注释‘ => $infoAll[‘UserComment‘],
‘用户注释编码‘ => $infoAll[‘UserCommentEncoding‘],
‘缩略图Exif文件类型‘ => $this->getImgtype($imgPath,‘Exif‘),
‘缩略图Mime文件类型‘ => $infoAll[‘Thumbnail.MimeType‘],
‘制造商‘ => $infoAll[‘Make‘],
‘型号‘ => $infoAll[‘Model‘],
‘方向‘ => array_search($infoAll[‘Orientation‘],array(
‘top left side‘ => 1,
‘top right side‘ => 2,
‘bottom right side‘ => 3,
‘bottom left side‘ => 4,
‘left side top‘ => 5,
‘right side top‘ => 6,
‘right side bottom‘ => 7,
‘left side bottom‘ => 8
)),
‘水平分辨率‘ => $infoAll[‘XResolution‘],
‘垂直分辨率‘ => $infoAll[‘YResolution‘],
‘分辨率单位‘ => array_search($infoAll[‘ResolutionUnit‘],array(
‘无单位‘ => 1,
‘英寸‘ => 2,
‘厘米‘ => 3
)),
‘创建软件‘ => $infoAll[‘Software‘],
‘最后修改时间‘ => $infoAll[‘DateTime‘],
‘YCbCr位置控制‘ => $infoAll[‘YCbCrPositioning‘] == 1 ? ‘像素阵列的中心‘ : ‘基准点‘,
‘Exif图像IFD的指针‘ => $infoAll[‘Exif_IFD_Pointer‘],
‘压缩方式