在php.ini文件中，我需要一个数字“ 2M”-这是什么意思？

Question

My employer needs a change to some PHP files that lead me to need to look in the 'php.ini' file which I have never done before. The line I care about is:

upload_max_filesize = 2M

Does '2M' mean 2 million? If not, what does it mean? I don't need to change it, I just need to know what number it represents.

Answer 1

2 megabytes. I don't know if that's 2^20 bytes or 10^6 bytes, but that doesn't really make much of a difference.

Answer 2

This is a PHP shorthand byte value. You can find out more from http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes

Answer 3

2M is 2 megabytes (2*1024*1024)

You can read about it here and here

Answer 4

2M=2*2^10 BYTES . This is the default MAX SIZE for UPLOAD defined by PHP , which can be changed to any number you like