mysql-fetch-lengths.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mysql-fetch-lengths" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mysql_fetch_lengths</refname>
  <refpurpose>取得结果集中每个输出的长度</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <warning>
   &mysql.alternative.note;
   <simplelist role="alternatives">
    <member><function>mysqli_fetch_lengths</function></member>
    <member><methodname>PDOStatement::getColumnMeta</methodname></member>
   </simplelist>
  </warning>
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>mysql_fetch_lengths</methodname>
   <methodparam><type>resource</type><parameter>result</parameter></methodparam>
  </methodsynopsis>
  <para>
   返回数组，对应 MySQL 查询中获取的最后一行的每个字段的长度。
  </para>
  <para>
   <function>mysql_fetch_lengths</function> 将上一次
   <function>mysql_fetch_row</function>、<function>mysql_fetch_assoc</function>、<function>mysql_fetch_array</function>
   和 <function>mysql_fetch_object</function> 所返回的最后一行的每个字段的长度储存到一个数组中，偏移量从 0 开始。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysql.result.description;
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   An <type>array</type> of lengths on success&return.falseforfailure;.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mysql_fetch_lengths</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$result = mysql_query("SELECT id,email FROM people WHERE id = '42'");
if (!$result) {
    echo 'Could not run query: ' . mysql_error();
    exit;
}
$row     = mysql_fetch_assoc($result);
$lengths = mysql_fetch_lengths($result);

print_r($row);
print_r($lengths);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Array
(
    [id] => 42
    [email] => user@example.com
)
Array
(
    [0] => 2
    [1] => 16
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

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

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