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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<chapter xml:id="language.operators" xmlns="http://docbook.org/ns/docbook">
<title>Operators</title>
<simpara>
An operator is something that takes one or more values (or
expressions, in programming jargon) and yields another value (so that the
construction itself becomes an expression).
</simpara>
<para>
Operators can be grouped according to the number of values they take. Unary
operators take only one value, for example <literal>!</literal> (the
<link linkend="language.operators.logical">logical not operator</link>) or
<literal>++</literal> (the
<link linkend="language.operators.increment">increment operator</link>).
Binary operators take two values, such as the familiar
<link linkend="language.operators.arithmetic">arithmetical operators</link>
<literal>+</literal> (plus) and <literal>-</literal> (minus), and the
majority of PHP operators fall into this category. Finally, there is a
single <link linkend="language.operators.comparison.ternary">ternary
operator</link>, <literal>? :</literal>, which takes three values; this is
usually referred to simply as "the ternary operator" (although it could
perhaps more properly be called the conditional operator).
</para>
<para>
A full list of PHP operators follows in the section
<link linkend="language.operators.precedence">Operator Precedence</link>.
The section also explains operator precedence and associativity, which govern
exactly how expressions containing several different operators are
evaluated.
</para>
&language.operators.precedence;
&language.operators.arithmetic;
&language.operators.increment;
&language.operators.assignment;
&language.operators.bitwise;
&language.operators.comparison;
&language.operators.errorcontrol;
&language.operators.execution;
&language.operators.logical;
&language.operators.string;
&language.operators.array;
&language.operators.type;
</chapter>
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