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72059f6530
Would be nice if we could actually link to these, but this is as good as it goes for now.
91 lines
2.3 KiB
XML
91 lines
2.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.sqrt" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>sqrt</refname>
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<refpurpose>Square root</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>float</type><methodname>sqrt</methodname>
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<methodparam><type>float</type><parameter>num</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the square root of <parameter>num</parameter>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>num</parameter></term>
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<listitem>
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<para>
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The argument to process
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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The square root of <parameter>num</parameter>
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or the special value <literal>NAN</literal> for negative numbers.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>sqrt</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Precision depends on your precision directive
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echo sqrt(9); // 3
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echo sqrt(10); // 3.16227766 ...
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>pow</function></member>
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<member><constant>M_SQRTPI</constant> - <code>sqrt(pi)</code></member>
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<member><constant>M_2_SQRTPI</constant> - <code>2/sqrt(pi)</code></member>
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<member><constant>M_SQRT2</constant> - <code>sqrt(2)</code></member>
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<member><constant>M_SQRT3</constant> - <code>sqrt(3)</code></member>
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<member><constant>M_SQRT1_2</constant> - <code>1/sqrt(2)</code></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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