Cronje

For the most part, I understand the math (and the parts I don't, I have faith are accurate). After reviewing what the range() function does, can I assume that the code will still work if I increased the size of the grid? The only part I'm truly confused about is the setting of the points. What specifically do the numbers mean? How do I determine what number corresponds with each grid square?

Woops, just realized that I didn't clarify - the image is just for demonstration purposes. What I intend to use is a multidimensional array.

Is there a way, through PHP, that I could find which squares a line being drawn from square X to square Y would intersect? For example: You can clearly see that the line runs through A1, A2, A3, B3, B4, B5. How can I make PHP determine the same thing?

That worked perfectly. Thanks!

I'm trying to determine the number of results from a SELECT, but am having trouble. My code: $query = mysql_query("SELECT * FROM tablename WHERE name='xxx'"); $num = mysql_num_rows($query); It works fine when 'xxx' is in the table, but when it finds none, 'echo $num;' doesn't display anything. Help please! -Cronje