doc-zh/reference/pgsql/functions/pg-unescape-bytea.xml at master · php/doc-zh · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 5f1a92089fa4efe81e9777f87f9ed93f4853898b Maintainer: dallas Status: ready -->
<!-- CREDITS: mowangjuanzi, Luffy -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.61 -->
<refentry xml:id="function.pg-unescape-bytea" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_unescape_bytea</refname>
  <refpurpose>
   反转义 bytea 类型的二进制数据
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>pg_unescape_bytea</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_unescape_bytea</function> 反转义 PostgreSQL bytea 数据值。返回反转义后的字符串，可能包含二进制数据。
  </para>
  <note>
   <para>
    当 <literal>SELECT</literal> bytea 类型时，PostgreSQL
    返回前缀为“\”的八进制字节值（例如 \032）。用户需要手动将其转换回二进制格式。
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       <type>string</type>，包含 PostgreSQL bytea 数据，需要转换为 PHP 二进制字符串。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   包含反转义数据的 <type>string</type>。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_unescape_bytea</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
  // Connect to the database
  $dbconn = pg_connect('dbname=foo');

  // Get the bytea data
  $res = pg_query("SELECT data FROM gallery WHERE name='Pine trees'");
  $raw = pg_fetch_result($res, 'data');

  // Convert to binary and send to the browser
  header('Content-type: image/jpeg');
  echo pg_unescape_bytea($raw);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

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