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16.6. Expressions

An expression is the basic building block of the language. Anything with a value can be thought of as an expression. Examples include:


By combining many of these basic expressions, you can build larger, more complex expressions.

Note that the echo statement we've used in numerous examples cannot be part of a complex expression because it does not have a return value. The print statement, on the other hand, can be used as part of complex expression—it does have a return value. In all other respects, echo and print are identical: they output data.

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