PHP rounding problem (5.2.3)? -


I'm thinking that I got an issue with the sphere in PHP, especially 5.2.3 (I'm not sure Other versions of this time): 

  $ t = 0; $ Tax amount = (5.000 / 100) * 0.7; $ T + = $ tax amount; Var_dump ($ t); // Flat (0.035) var_dump (round ($ t, 2)); // float (0.03) var_dump (number_ format ($ t, 2)); // 0.04 "0.04" for 0.035 should I round for 0.04 or am I just crazy?  
  Edit   
 Thxs, I think I would have to do this instead:  
  $ t = 0; $ Tax amount = BCMUL (BCDIV (5.000, 100, 3), 0.7, 3); $ T + = $ tax amount; Var_dump ($ t); // Flat (0.035) var_dump (round ($ t, 2)); // float (0.04) var_dump (number_ format ($ t, 2)); // string (4) "0.04"  
 
 what works. 
 
 BTW, I calculate the tax in the shopping cart. Order total is 0.70 (70 cents) and tax is 5%. 
 
  Edit  
 
 Thxs, to show where the problem is: 
 
  printf ('%' 18f ', 5.000 / 100 * 0.7);

Floating is bad.

Excerpt:

Then do not believe the number of trusting numbers on the last issue, and never compare the floating point numbers for equality . If high precision is required, more functions are available.

If you want to know why and how do I look:


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