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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.bcround" xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude">
<refnamediv>
<refname>bcround</refname>
<refpurpose>Round arbitrary precision number</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>bcround</methodname>
<methodparam><type>string</type><parameter>num</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>precision</parameter><initializer>0</initializer></methodparam>
<methodparam choice="opt"><type>RoundingMode</type><parameter>mode</parameter><initializer>RoundingMode::HalfAwayFromZero</initializer></methodparam>
</methodsynopsis>
<simpara>
Returns the rounded value of <parameter>num</parameter> to
specified <parameter>precision</parameter>
(number of digits after the decimal point).
<parameter>precision</parameter> can also be negative or zero (default).
</simpara>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.round')/db:refsect1[@role='parameters']/descendant::db:varlistentry[1])" />
<xi:include xpointer="xmlns(db=http://docbook.org/ns/docbook) xpointer(id('function.round')/db:refsect1[@role='parameters']/descendant::db:varlistentry[2])" />
<varlistentry>
<term><parameter>mode</parameter></term>
<listitem>
<simpara>
Specifies the rounding mode.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<simpara>
Returns a numeric string representing <parameter>num</parameter> rounded to the given precision.
</simpara>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
This function throws a <exceptionname>ValueError</exceptionname> in the following cases:
<simplelist>
<member><parameter>num</parameter> is not a well-formed BCMath numeric string.</member>
<member><parameter>scale</parameter> is outside the valid range.</member>
</simplelist>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>bcround</function> examples</title>
<programlisting role="php">
<![CDATA[
<?php
var_dump(bcround('3.4'));
var_dump(bcround('3.5'));
var_dump(bcround('3.6'));
var_dump(bcround('3.6', 0));
var_dump(bcround('5.045', 2));
var_dump(bcround('5.055', 2));
var_dump(bcround('345', -2));
var_dump(bcround('345', -3));
var_dump(bcround('678', -2));
var_dump(bcround('678', -3));
?>
]]>
</programlisting>
&example.outputs;
<screen role="php">
<![CDATA[
string(1) "3"
string(1) "4"
string(1) "4"
string(1) "4"
string(4) "5.05"
string(4) "5.06"
string(3) "300"
string(1) "0"
string(3) "700"
string(4) "1000"
]]>
</screen>
</example>
<example>
<title>
Example of using <function>bcround</function> with different <parameter>precision</parameter> values
</title>
<programlisting role="php">
<![CDATA[
<?php
$number = '123.45';
var_dump(bcround($number, 3));
var_dump(bcround($number, 2));
var_dump(bcround($number, 1));
var_dump(bcround($number, 0));
var_dump(bcround($number, -1));
var_dump(bcround($number, -2));
var_dump(bcround($number, -3));
?>
]]>
</programlisting>
&example.outputs;
<screen role="php">
<![CDATA[
string(7) "123.450"
string(6) "123.45"
string(5) "123.5"
string(3) "123"
string(3) "120"
string(3) "100"
string(1) "0"
]]>
</screen>
</example>
<example>
<title>
Example of using <function>bcround</function> with different <parameter>mode</parameter> values
</title>
<programlisting role="php">
<![CDATA[
<?php
echo 'Rounding modes with 9.5' . PHP_EOL;
var_dump(bcround('9.5', 0, RoundingMode::HalfAwayFromZero));
var_dump(bcround('9.5', 0, RoundingMode::HalfTowardsZero));
var_dump(bcround('9.5', 0, RoundingMode::HalfEven));
var_dump(bcround('9.5', 0, RoundingMode::HalfOdd));
var_dump(bcround('9.5', 0, RoundingMode::TowardsZero));
var_dump(bcround('9.5', 0, RoundingMode::AwayFromZero));
var_dump(bcround('9.5', 0, RoundingMode::NegativeInfinity));
var_dump(bcround('9.5', 0, RoundingMode::PositiveInfinity));
echo PHP_EOL;
echo 'Rounding modes with 8.5' . PHP_EOL;
var_dump(bcround('8.5', 0, RoundingMode::HalfAwayFromZero));
var_dump(bcround('8.5', 0, RoundingMode::HalfTowardsZero));
var_dump(bcround('8.5', 0, RoundingMode::HalfEven));
var_dump(bcround('8.5', 0, RoundingMode::HalfOdd));
var_dump(bcround('8.5', 0, RoundingMode::TowardsZero));
var_dump(bcround('8.5', 0, RoundingMode::AwayFromZero));
var_dump(bcround('8.5', 0, RoundingMode::NegativeInfinity));
var_dump(bcround('8.5', 0, RoundingMode::PositiveInfinity));
?>
]]>
</programlisting>
&example.outputs;
<screen role="php">
<![CDATA[
Rounding modes with 9.5
string(2) "10"
string(1) "9"
string(2) "10"
string(1) "9"
string(1) "9"
string(2) "10"
string(1) "9"
string(2) "10"
Rounding modes with 8.5
string(1) "9"
string(1) "8"
string(1) "8"
string(1) "9"
string(1) "8"
string(1) "9"
string(1) "8"
string(1) "9"
]]>
</screen>
</example>
<example>
<title>
Example of using <function>bcround</function> with different <parameter>mode</parameter> values
when specifying <parameter>precision</parameter>
</title>
<programlisting role="php">
<![CDATA[
<?php
echo 'Using RoundingMode::HalfAwayFromZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfAwayFromZero));
var_dump(bcround(-1.55, 1, RoundingMode::HalfAwayFromZero));
echo PHP_EOL;
echo 'Using RoundingMode::HalfTowardsZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfTowardsZero));
var_dump(bcround(-1.55, 1, RoundingMode::HalfTowardsZero));
echo PHP_EOL;
echo 'Using RoundingMode::HalfEven with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfEven));
var_dump(bcround(-1.55, 1, RoundingMode::HalfEven));
echo PHP_EOL;
echo 'Using RoundingMode::HalfOdd with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfOdd));
var_dump(bcround(-1.55, 1, RoundingMode::HalfOdd));
echo PHP_EOL;
echo 'Using RoundingMode::TowardsZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::TowardsZero));
var_dump(bcround(-1.55, 1, RoundingMode::TowardsZero));
echo PHP_EOL;
echo 'Using RoundingMode::AwayFromZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::AwayFromZero));
var_dump(bcround(-1.55, 1, RoundingMode::AwayFromZero));
echo PHP_EOL;
echo 'Using RoundingMode::NegativeInfinity with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::NegativeInfinity));
var_dump(bcround(-1.55, 1, RoundingMode::NegativeInfinity));
echo PHP_EOL;
echo 'Using RoundingMode::PositiveInfinity with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::PositiveInfinity));
var_dump(bcround(-1.55, 1, RoundingMode::PositiveInfinity));
?>
]]>
</programlisting>
&example.outputs;
<screen role="php">
<![CDATA[
Using RoundingMode::HalfAwayFromZero with 1 decimal digit precision
string(3) "1.6"
string(4) "-1.6"
Using RoundingMode::HalfTowardsZero with 1 decimal digit precision
string(3) "1.5"
string(4) "-1.5"
Using RoundingMode::HalfEven with 1 decimal digit precision
string(3) "1.6"
string(4) "-1.6"
Using RoundingMode::HalfOdd with 1 decimal digit precision
string(3) "1.5"
string(4) "-1.5"
Using RoundingMode::TowardsZero with 1 decimal digit precision
string(3) "1.5"
string(4) "-1.5"
Using RoundingMode::AwayFromZero with 1 decimal digit precision
string(3) "1.6"
string(4) "-1.6"
Using RoundingMode::NegativeInfinity with 1 decimal digit precision
string(3) "1.5"
string(4) "-1.6"
Using RoundingMode::PositiveInfinity with 1 decimal digit precision
string(3) "1.6"
string(4) "-1.5"
]]>
</screen>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><function>bcceil</function></member>
<member><function>bcfloor</function></member>
</simplelist>
</refsect1>
</refentry>
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