4. Increasing/Decreasing Operators (5)

Learning objective: to understand increment and decrease (++ --). <? PHP $ A = 5; $ B = $ A ++; // 1. Return its own value. 2. Add a value to 1. Analysis: the first value of $ A is 5. When $ B is reached, the value $ A ++ first returns 5 to $ B, so the value of $ B is 5. Later, the second change occurs. $ A will add 1 to it, change the original value, and finally get the new value 6. The same is true for other calculations. Var_dump ($ A, $ B); // 6 5 // * $ A --, -- $ A you can try it yourself. $ A = 3; $ B = ++ $ A; // 1. Add the value to 1 first. 2. Return the new value. Var_dump ($ A, $ B); // 4 4?> * You can add or subtract a new value as long as the symbol is in front of the variable. After the symbol is placed, it is to first return its own value, plus or minus.

4. Increasing/Decreasing Operators (5)