Source of: /manual/en/language.operators.php
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<div>
<h1>Operators</h1>
<h2>Table of Contents</h2><ul class="chunklist chunklist_chapter"><li><a href="language.operators.precedence.php">Operator Precedence</a></li><li><a href="language.operators.arithmetic.php">Arithmetic Operators</a></li><li><a href="language.operators.assignment.php">Assignment Operators</a></li><li><a href="language.operators.bitwise.php">Bitwise Operators</a></li><li><a href="language.operators.comparison.php">Comparison Operators</a></li><li><a href="language.operators.errorcontrol.php">Error Control Operators</a></li><li><a href="language.operators.execution.php">Execution Operators</a></li><li><a href="language.operators.increment.php">Incrementing/Decrementing Operators</a></li><li><a href="language.operators.logical.php">Logical Operators</a></li><li><a href="language.operators.string.php">String Operators</a></li><li><a href="language.operators.array.php">Array Operators</a></li><li><a href="language.operators.type.php">Type Operators</a></li></ul>
<p class="simpara">
An operator is something that you feed with one or more values (or
expressions, in programming jargon) which yields another value (so that the
construction itself becomes an expression). So you can think of functions
or constructions that return a value (like print) as operators and those
that return nothing (like echo) as any other thing.
</p>
<p class="para">
There are three types of operators. Firstly there is the unary operator which
operates on only one value, for example ! (the negation operator) or ++
(the increment operator). The second group are termed binary operators; this
group contains most of the operators that PHP supports, and a list follows
below in the section <a href="language.operators.precedence.php" class="link">Operator
Precedence</a>.
</p>
<p class="para">
The third group is the ternary operator: ?:. It should be used to select
between two expressions depending on a third one, rather than to select two
sentences or paths of execution. Surrounding ternary expressions with
parentheses is a very good idea.
</p>
</div>
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