operators.xml

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<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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