This is my first php program!

Assignment with operation
In addition to the basic assignment operator, there are several assignment operators
that are convenient shorthand. These operators consist of a binary operator fol-
lowed directly by an equals sign, and their effect is the same as performing the opera-
tion with the operands, then assigning the resulting value to the lefthand operand.
These assignment operators are:
Plus-equals (
+=
)
Adds the righthand operand to the value of the lefthand operand, then assigns
the result to the lefthand operand.
$a += 5
is the same as
$a = $a + 5
.
Minus-equals (–
=
)
Subtracts the righthand operand from the value of the lefthand operand, then
assigns the result to the lefthand operand.
Divide-equals (
/=
)
Divides the value of the lefthand operand by the righthand operand, then assigns
the result to the lefthand operand.
Multiply-equals (
*=
)
Multiplies the righthand operand with the value of the lefthand operand, then
assigns the result to the lefthand operand.
Modulus-equals (
%=
)
Performs the modulus operation on the value of the lefthand operand and the
righthand operand, then assigns the result to the lefthand operand.
Bitwise-XOR-equals (
^=
)
Performs a bitwise XOR on the lefthand and righthand operands, then assigns
the result to the lefthand operand.
Bitwise-AND-equals (
&=
)
Performs a bitwise AND on the value of the lefthand operand and the righthand
operand, then assigns the result to the lefthand operand.
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