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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.gmp-scan1">
<refnamediv>
<refname>gmp_scan1</refname>
<refpurpose>Scan for 1</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>gmp_scan1</methodname>
<methodparam><type>resource</type><parameter>a</parameter></methodparam>
<methodparam><type>int</type><parameter>start</parameter></methodparam>
</methodsynopsis>
<para>
Scans <parameter>a</parameter>, starting with bit
<parameter>start</parameter>, towards more significant bits,
until the first set bit is found.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>a</parameter></term>
<listitem>
<para>
The number to scan.
</para>
&gmp.parameter;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>start</parameter></term>
<listitem>
<para>
The starting bit.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the index of the found bit, as an <type>integer</type>.
If no set bit is found, -1 is returned.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>gmp_scan1</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// "1" bit is found at position 3. index starts at 0
$s1 = gmp_init("01000", 2);
echo gmp_scan1($s1, 0) . "\n";
// "1" bit is found at position 9. index starts at 5
$s2 = gmp_init("01000001111", 2);
echo gmp_scan1($s2, 5) . "\n";
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
3
9
]]>
</screen>
</example>
</para>
</refsect1>
</refentry>
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