How does php save base64 encoding to a local file?

The local code uses C ++ to encode an image in base64. after The post is submitted to the web server, php decodes the base64_decode and saves the image. Use the hexadecimal editor to view and compare the source file (local source file image), and find that the 0d-carriage return is lost after saving the file. Process...

1. The local code uses C ++ to encode an image in base64. after The post is submitted to the web server, php decodes the base64_decode and saves the image. Use the hexadecimal editor to view and compare the source file (local source file image ).0d-- Carriage return.

2. The problem encountered in the process is that the base64 encoded data + number obtained after post transmission _ POST ['data'] is changed to a space, and the phpstr_replace(...)Replace it with the original one. you can confirm that there is no problem.

3. After$img = base64_decode(...)After decoding, the returnedstrlen($img)The length of the source file is the same as that of the source file. Whether it is usedfor(...) fwrite(...);Orfile_put_contents(...)All are missing bytes 0d

To be resolved: See the title. resolved: the process is correct when opening the file stream.

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1. The local code uses C ++ to encode an image in base64. after The post is submitted to the web server, php decodes the base64_decode and saves the image. Use the hexadecimal editor to view and compare the source file (local source file image ).0d-- Carriage return.

2. The problem encountered in the process is that the base64 encoded data + number obtained after post transmission _ POST ['data'] is changed to a space, and the phpstr_replace(...)Replace it with the original one. you can confirm that there is no problem.

3. After$img = base64_decode(...)After decoding, the returnedstrlen($img)The length of the source file is the same as that of the source file. Whether it is usedfor(...) fwrite(...);Orfile_put_contents(...)All are missing bytes 0d

To be resolved: See the title. resolved: the process is correct when opening the file stream.

You can directly output the image on the web to see if it can be displayed normally.