Example of data/base64 data transfer image file output in PHP

Data/base64 webmasters often use more data. I often see that they generate data/base64 data for images and then input the data. This shows a very long string, now let's take a look at the php input method. Let's take a look at data/B.

Data/base64 webmasters often use more data. I often see that they generate data/base64 data for images and then input the data. This shows a very long string, now let's take a look at the php input method.

Let's see what data/base64 is.

What is data: image/*; base64?

A: This is Data URI scheme.

Still don't understand?

Ps: Data URI scheme is defined in RFC2397. it aims to embed small Data into a webpage without loading it from an external file.

For example:

1. Data: image/png; base64, signature/KEAUFFR0Cbng3nQPw68ArZdAlOZppPFIBhH5EAB8b + Tlt9MYQ6i1BuqFaq1CKSVcxZ2Acs6406KUgpt5/signature % 3D % 3D.

Copy and paste these characters to the address bar of Firefox and go to it to see it, a 1x36 white-gray png image.

In the preceding Data URI, data indicates the protocol name for obtaining Data. image/png indicates the data type name, and base64 indicates the Data encoding method, the comma is followed by the base64 encoded data of the image/png file.

Currently, Data URI scheme supports the following types:

Data:, text data

Data: text/plain, text data

Data: text/html, HTML code

Data: text/html; base64, base64 encoded HTML code

Data: text/css, CSS code

Data: text/css; base64, base64 encoded CSS code

Data: text/javascript, Javascript code

Data: text/javascript; base64, base64 encoded Javascript code

Data: image/gif; base64, base64 encoded gif image data

Data: image/png; base64, base64 encoded png image data

Data: image/jpeg; base64, base64 encoded jpeg image data

Data: image/x-icon; base64, base64 encoded icon image data

Base64: to put it simply, it translates some 8-bit data into standard ASCII characters. There are many free base64 encoding and decoding tools on the Internet, and base64_encode () can be used in PHP () encoding, such

Echo base64_encode(file_get_contents('emtalk.png '));

Currently, IE8, Firfox, Chrome, and Opera browsers support such small file embedding.

Write a simple small function:

2. Header ('content-type: text/html; charset = utf-8 ');
3. Function image_base64 ($ image_file ){
4. If (emptyempty ($ image_file) return false;
5. $ Image_info = getimagesize ($ image_file );
6. $ Base64_image_content = "data: {$ image_info ['Mime ']}; base64,". chunk_split (base64_encode (file_get_contents ($ image_file )));
7. Return $ base64_image_content;
8. }
9. ?>
11.  
12. Blog by wind-Image Encoding output test 
15. "Img1" width = '000000' src =" "/>
17.  

I have mastered the PHP generation code, so today I will bring another solution to my friends to convert data: image/; base64 data streams back to image files (function ):

1. /**
2. * Decompile data/base64 data streams and create image files
3. * @ Author Lonny [email protected]
4. * @ Param string $ baseData data/base64 data stream
5. * @ Param string $ Dir stores the image file directory
6. * @ Param string $ fileName name of the image file (excluding the file suffix)
7. * @ Return mixed return the path or Boolean type of the newly created file.
8. */
9. Function base64DecImg ($ baseData, $ Dir, $ fileName ){
10. // Front-end access URL API
11. $ __Url __= 'http: // emtalk.net /';
12. // API for obtaining the absolute path of the server root directory
13. $ __Root __= isset ($ _ SERVER ['document _ root'])? $ _ SERVER ['document _ root'] :( isset ($ _ SERVER ['appl _ PHYSICAL_PATH '])? Trim ($ _ SERVER ['appl _ PHYSICAL_PATH '], "\") :( isset ($ _ ['path _ TRANSLATED'])? Str_replace ($ _ SERVER ["PHP_SELF"]): str_replace ("/", "\", isset ($ _ SERVER ["PHP_SELF"])? $ _ SERVER ["PHP_SELF"] :( isset ($ _ SERVER ["URL"])? $ _ SERVER ["URL"]: $ _ SERVER ["SCRIPT_NAME"]), "", isset ($ _ SERVER ["PATH_TRANSLATED"])? $ _ SERVER ["PATH_TRANSLATED"]: $ _ SERVER ["SCRIPT_FILENAME"]);
14. // Appeal the two variables and modify them based on the actual situation
15. Try {
16. $ ExpData = explode (';', $ baseData );
17. $ Postfix = explode ('/', $ expData [0]);
18. If (strstr ($ postfix [0], 'image ')){
19. $ Postfix = $ postfix [1] = 'jpeg '? 'Jpg ': $ postfix [1];
20. $ StorageDir = $ Dir. DIRECTORY_SEPARATOR. $ fileName. '.'. $ postfix;
21. $ Export = base64_decode (str_replace ("{$ expData [0]}; base64,", '', $ baseData ));
22. $ ReturnDir = str_replace ('/', '\', $ __root _), '', $ storageDir );
23. Try {
24. File_put_contents ($ storageDir, $ export );
25. Return $ __url _. $ returnDir;
26. } Catch (Exception $ e ){
27. Return false;
28. }
29. }
30. } Catch (Exception $ e ){
31. Return false;
32. }
33. Return false;
34. }

Do you understand the code? This is just a simple small example. through code optimization and adjustment, you can restore data: image/and base64 data files of different data types!