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You have probably all heard the term expression used in mathematics. We use expressions in PHP to preform operations and give an answer to a single value. These expressions are made up of two parts, the operators and the operands. The operands can be variables, numbers, strings, boolean values, or other expressions. Here is an example:

a = 3 + 4

In this expression the operands are a, 3 and 4

b = (3 + 4) / 2

In this expression the expression (3+4) is used as an operand along with b and 2.

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