PHP返回不同的周数然后系统

Question

I came across problem in PHP script that returns week number one higher then system does. In both situations timezone is set to "Europe/Prague".

I've done some tests. Both tests were performed on Debian 8.2 with PHP 5.6.14-0+deb8u1.

date +%W

result was: 43

echo date("W");

result was: 44

Answer 1

date +%W

Returns the week number from a zero index. (0-53)

echo date("W");

Returns the week number from a one index. (1-54)

This means that you'll always need to add one to the linux week or remove one from the php week to compare the two.