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https://github.com/sigmasternchen/php-doc-en
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dc3cf08731
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@189864 c90b9560-bf6c-de11-be94-00142212c4b1
119 lines
3.2 KiB
XML
119 lines
3.2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.5 $ -->
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<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.61 -->
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<refentry id='function.pg-unescape-bytea'>
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<refnamediv>
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<refname>pg_unescape_bytea</refname>
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<refpurpose>
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Unescape binary for bytea type
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</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>string</type><methodname>pg_unescape_bytea</methodname>
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<methodparam><type>string</type><parameter>data</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>pg_unescape_bytea</function> unescapes PostgreSQL bytea data
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values. It returns the unescaped string, possibly containing binary data.
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</para>
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<note>
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<para>
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When you <literal>SELECT</literal> a bytea type, PostgreSQL returns octal byte values
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prefixed with '\' (e.g. \032). Users are supposed to convert back to
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binary format manually.
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</para>
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<para>
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This function requires PostgreSQL 7.2 or later. With PostgreSQL
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7.2.0 and 7.2.1, bytea values must be cast when you enable
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multi-byte support. i.e. <literal>INSERT INTO test_table (image)
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VALUES ('$image_escaped'::bytea);</literal> PostgreSQL 7.2.2 or
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later does not need a cast. The exception is when the client and backend
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character encoding does not match, and there may be multi-byte
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stream error. User must then cast to bytea to avoid this error.
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</para>
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</note>
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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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<varlistentry>
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<term><parameter>data</parameter></term>
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<listitem>
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<para>
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A <type>string</type> containing PostgreSQL bytea data to be converted into
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a PHP binary string.
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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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A <type>string</type> containing the unescaped data.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>pg_unescape_bytea</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Connect to the database
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$dbconn = pg_connect('dbname=foo');
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// Get the bytea data
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$res = pg_query("SELECT data FROM gallery WHERE name='Pine trees'");
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$raw = pg_fetch_result($res, 'data');
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// Convert to binary and send to the browser
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header('Content-type: image/jpeg');
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echo pg_unescape_bytea($raw);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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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>pg_escape_bytea</function></member>
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<member><function>pg_escape_string</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:"../../../../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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