mirror of
https://github.com/sigmasternchen/php-doc-en
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149 lines
4.4 KiB
XML
149 lines
4.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="mysqli-result.fetch-column" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>mysqli_result::fetch_column</refname>
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<refname>mysqli_fetch_column</refname>
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<refpurpose>Fetch a single column from the next row of a result set</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<para>&style.oop;</para>
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<methodsynopsis role="oop">
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<modifier>public</modifier> <type class="union"><type>null</type><type>int</type><type>float</type><type>string</type><type>false</type></type><methodname>mysqli_result::fetch_column</methodname>
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<methodparam choice="opt"><type>int</type><parameter>column</parameter><initializer>0</initializer></methodparam>
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</methodsynopsis>
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<para>&style.procedural;</para>
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<methodsynopsis role="procedural">
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<type class="union"><type>null</type><type>int</type><type>float</type><type>string</type><type>false</type></type><methodname>mysqli_fetch_column</methodname>
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<methodparam><type>mysqli_result</type><parameter>result</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>column</parameter><initializer>0</initializer></methodparam>
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</methodsynopsis>
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<para>
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Fetches one row of data from the result set and returns the 0-indexed column.
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Each subsequent call to this function will return the value from next row
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within the result set, or &false; if there are no more rows.
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</para>
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&database.fetch-null;
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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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&mysqli.result.description;
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<varlistentry>
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<term><parameter>column</parameter></term>
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<listitem>
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<para>
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0-indexed number of the column you wish to retrieve from the row. If
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no value is supplied, the first column will be returned.
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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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<function>mysqli_fetch_column</function> returns a single column
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from the next row of a result set or &false; if there are no more rows.
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</para>
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<warning>
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<para>
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There is no way to return another column from the same row if you
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use this function to retrieve data.
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</para>
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</warning>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<example>
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<title><methodname>mysqli_result::fetch_column</methodname> example</title>
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<para>&style.oop;</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
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$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
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$query = "SELECT CountryCode, Name FROM City ORDER BY ID DESC LIMIT 5";
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$result = $mysqli->query($query);
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/* fetch a single value from the second column */
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while ($Name = $result->fetch_column(1)) {
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printf("%s\n", $Name);
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}
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]]>
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</programlisting>
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<para>&style.procedural;</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
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$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");
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$query = "SELECT CountryCode, Name FROM City ORDER BY ID DESC LIMIT 5";
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$result = mysqli_query($mysqli, $query);
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/* fetch a single value from the second column */
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while ($Name = mysqli_fetch_column($result, 1)) {
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printf("%s\n", $Name);
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}
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]]>
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</programlisting>
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&examples.outputs.similar;
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<screen>
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<![CDATA[
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Rafah
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Nablus
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Jabaliya
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Hebron
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Khan Yunis
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]]>
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</screen>
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</example>
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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>mysqli_fetch_all</function></member>
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<member><function>mysqli_fetch_array</function></member>
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<member><function>mysqli_fetch_assoc</function></member>
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<member><function>mysqli_fetch_object</function></member>
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<member><function>mysqli_fetch_row</function></member>
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<member><function>mysqli_data_seek</function></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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