PHP exif 介绍

 // PHP exif // -- // wikipedia 介绍: // EXIF(Exchangeable image file format)是可交换图像文件的缩写,是专门为数码相机的照片设定的,可以记录数码照片的属性信息和拍摄数据。 // EXIF可以附加于JPEG、TIFF、RIFF等文件之中,为其增加有关数码相机拍摄信息的内容和索引图或图像处理软件的版本信息。 // -- // php 中 exif 可以处理图片的元数据。例如:可以读取数码相机照到的照片的元数据。 // With the exif extension you are able to work with image meta data. // For example, you may use exif functions to read meta data of pictures taken from digital cameras // by working with information stored in the headers of the JPEG and TIFF images. // // Windows 用户使用该扩展必须启用 mbstring 扩展,并且 mbstring 扩展必须在 exif 之前加在。 // Windows users must enable both the php_mbstring.dll and php_exif.dll DLL's in php.ini. // The php_mbstring.dll DLL must be loaded before the php_exif.dll DLL so adjust your php.ini accordingly. // -- // // 函数 exif_imagetype() // 1/1 // 获取图片的扩展,返回一个整数,对应于 exif 中的常量 exif_read_data() // 1/4 // Reads the EXIF headers from JPEG or TIFF, 返回一数组 // EXIF headers tend to be present in JPEG/TIFF images generated by digital cameras, // but unfortunately each digital camera maker has a different idea of how to actually tag their images, // so you can't always rely on a specific Exif header being present. exif_tagname() // 1/1 exif_thumbnail() // 1/4 // Retrieve the embedded thumbnail of a TIFF or JPEG image read_exif_data() // alias of exif_read_data() 

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