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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.54 $ -->
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<!-- $Revision: 1.55 $ -->
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<chapter id="language.operators">
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<title>Operators</title>
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<simpara>
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An operator is something that you feed with one or more values (or
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expressions in the programing jargon) and yields another value (so that the
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expressions, in programming jargon) which yields another value (so that the
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construction itself becomes an expression). So you can think of functions
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or constructions that return a value (like print) as operators and those
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that return nothing (like echo) as any other thing.
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</simpara>
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<para>
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There are a few types of operators, there is the unairy operator which
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There are three types of operators. Firstly there is the unary operator which
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operates on only one value, for example ! (the negation operator) or ++
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(the increment operator). The second group is called binary operators; this
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group contains of the most operators that PHP supports and a list follows
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(the increment operator). The second group are termed binary operators; this
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group contains most of the operators that PHP supports, and a list follows
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below in the section <link linkend="language.operators.precedence">Operator
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Precedence</link>.
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</para>
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<para>
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The third 'group is the ternairy operator: ?:. It should be used to select
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between two expressions depending on a third one, not to select two
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sentences or paths of execution. And always surrounding ?: expressions with
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parenthesis is also a very good idea.
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The third group is the ternary operator: ?:. It should be used to select
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between two expressions depending on a third one, rather than to select two
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sentences or paths of execution. Surrounding ternary expressions with
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parentheses is a very good idea.
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</para>
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<sect1 id="language.operators.precedence">
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