Source of: /manual/en/language.operators.arithmetic.php
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<div id="language.operators.arithmetic" class="sect1">
<h2 class="title">Arithmetic Operators</h2>
<p class="simpara">
Remember basic arithmetic from school? These work just
like those.
</p>
<table class="doctable table">
<caption><b>Arithmetic Operators</b></caption>
<thead valign="middle">
<tr valign="middle">
<th>Example</th>
<th>Name</th>
<th>Result</th>
</tr>
</thead>
<tbody valign="middle" class="tbody">
<tr valign="middle">
<td align="left">-$a</td>
<td align="left">Negation</td>
<td align="left">Opposite of <var class="varname">$a</var>.</td>
</tr>
<tr valign="middle">
<td align="left">$a + $b</td>
<td align="left">Addition</td>
<td align="left">Sum of <var class="varname">$a</var> and <var class="varname">$b</var>.</td>
</tr>
<tr valign="middle">
<td align="left">$a - $b</td>
<td align="left">Subtraction</td>
<td align="left">Difference of <var class="varname">$a</var> and <var class="varname">$b</var>.</td>
</tr>
<tr valign="middle">
<td align="left">$a * $b</td>
<td align="left">Multiplication</td>
<td align="left">Product of <var class="varname">$a</var> and <var class="varname">$b</var>.</td>
</tr>
<tr valign="middle">
<td align="left">$a / $b</td>
<td align="left">Division</td>
<td align="left">Quotient of <var class="varname">$a</var> and <var class="varname">$b</var>.</td>
</tr>
<tr valign="middle">
<td align="left">$a % $b</td>
<td align="left">Modulus</td>
<td align="left">Remainder of <var class="varname">$a</var> divided by <var class="varname">$b</var>.</td>
</tr>
</tbody>
</table>
<p class="simpara">
The division operator ("/") returns a float value unless the two operands
are integers (or strings that get converted to integers) and the numbers
are evenly divisible, in which case an integer value will be returned.
</p>
<p class="simpara">
Operands of modulus are converted to integers (by stripping the decimal
part) before processing.
</p>
<blockquote><p><b class="note">Note</b>:
<span class="simpara">
Remainder <i>$a % $b</i> is negative for negative
<i>$a</i>.
</span>
</p></blockquote>
<p class="simpara">
See also the manual page on
<a href="ref.math.php" class="link">Math functions</a>.
</p>
</div><?php manual_footer(); ?>
