What known issues are there with arithmetic operation in PHP?
43
Is floating point math broken?
2203
String concatenation: concat() vs "+" operator
3171
Working with large numbers in PHP
69299
Why do these two multiplication operations give different results?
120580
What does "=>" mean in PHP?
157148
What are the valid characters in PHP variable, method, class, etc names?
139204
Why do numeric string comparisons give unexpected results?
34563
Why does PHP consider 0 to be equal to a string?
22339
Difference between pre-increment and post-increment in a loop?
7250
Reference - What does this error mean in PHP?
50543
Simple division in Java - is this a bug or a feature?
38967
What is the precedence of the + (plus) operator in Java?
114815
Floating point error in representation?
29593
What is the "->" PHP operator called?
75634
Doing calculations in MySQL vs PHP
65178
int((0.1+0.7)*10) = 7 in several languages. How to prevent this?
141951
Floating Point Limitations