Value assignment operator

The basic value assignment operator is "= ". You tend to think that it means "equal ". Don't think so. The true meaning of this is that the operand on the left gets the value of the expression on the right.
A value assignment expression is used to assign values. That is to say, the value of "$ a = 3" is 3. This allows you to do the following:

$ A = ($ B = 4) + 5;
// $ A is equal to 9 now, and $ B has been set to 4.

As a supplement to the value assignment operator, there is also a combined operator that operates on binary numbers and character passing. This operator allows you to use the value of the expression to be assigned. For example:

$ A = 3;
$ A + = 5; // sets $ a to 8, as if we had said: $ a = $ a + 5;
$ B = "Hello ";
$ B. = "There! "; // Sets $ B to" Hello There! ", Just like $ B = $ B." There! ";