You can also check to see if Integer( N/4) is odd or even.
If it is even Wednesday is set.
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Question
php check string decimal calculation
Hi experts,
i have a calendar with weekdays for events.
i store this days within my database as binary string.
So if an event is on Monday Tuesday and Wednesday i store
1110000 => Monday, Tuesday, Wednesday
If an event is on Friday,Saturday and Sunday i store
0000111 = Friday, Saturday and Sunday
Now i converted it for calculation in php by using bindec() to get a decimal as result:
Example:
1110000 => (2 pow 6) + (2 pow 5) +( 2 pow 4) + 0 + 0 + 0 + 0 = 112
Now i have a big problem. For example i want to search for all events for "Wednesday" that means my expression (2 pow 4) can exists in an integer between 1 - 127.
How can i calculate all results that are possible with (2 pow 4) so that i get:
Mo + Tue + Wed => 112
Mo + Wed + Fr => 84
Wed + Sa + Su => 19
Wed + Su => 17
....
so that i get a result array(112,84,19,17......)
has anybody an idea
CU BIBA
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Answers
Use the substr() function: http://www.w3schools.com/P
Wednesday is always the third element: So substr( S, 3,1) will give you the Wed value.
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by: d-glitchPosted on 2009-08-14 at 05:54:28ID: 25097428
Are you using all seven days?
If so then you have 128 possibilities: 0 - 127
Exactly half of these have the Wednesday bit set.
You can make this list for each day of the week, or you can convert back
to binary and do a bit-mask test.