mysql-field-len.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mysql-field-len" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysql_field_len</refname>
  <refpurpose>Возвращает длину указанного поля</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <warning>
   &mysql.alternative.note;
   <simplelist role="alternatives">
    <member><function>mysqli_fetch_field_direct</function> [length]</member>
    <member><methodname>PDOStatement::getColumnMeta</methodname> [len]</member>
   </simplelist>
  </warning>
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>int</type><type>false</type></type><methodname>mysql_field_len</methodname>
   <methodparam><type>resource</type><parameter>result</parameter></methodparam>
   <methodparam><type>int</type><parameter>field_offset</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>mysql_field_len</function> возвращает длину указанного поля.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysql.result.description;
    &mysql.field-offset.req.description;
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Длина указанного поля в случае успешного выполнения&return.falseforfailure;.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Пример использования <function>mysql_field_len</function></title>
    <programlisting role="php">
<![CDATA[
<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
    echo 'Не удалось выполнить запрос: ' . mysql_error();
    exit;
}

// Получит длину поля id так, как указано в структуре базы данных
$length = mysql_field_len($result, 0);
echo $length;
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    &info.deprecated.alias;
    <function>mysql_fieldlen</function>
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mysql_fetch_lengths</function></member>
    <member><function>strlen</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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