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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@146224 c90b9560-bf6c-de11-be94-00142212c4b1
99 lines
2.6 KiB
XML
99 lines
2.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.3 $ -->
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<refentry id="function.sqlite-udf-decode-binary">
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<refnamediv>
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<refname>sqlite_udf_decode_binary</refname>
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<refpurpose>Decode binary data passed as parameters to an UDF.</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>string</type><methodname>sqlite_udf_decode_binary</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>sqlite_udf_decode_binary</function> decodes the binary encoding
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that was applied to the parameter by either
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<function>sqlite_udf_encode_binary</function> or
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<function>sqlite_escape_string</function>.
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</para>
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<para>
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You must call this function on parameters passed to your UDF if you need
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them to handle binary data, as the binary encoding employed by PHP will
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obscure the content and of the parameter in its natural, non-coded form.
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</para>
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<para>
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PHP does not perform this encode/decode operation automatically as it would
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severely impact performance if it did.
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</para>
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<para>
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<example>
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<title>binary-safe max_length aggregation function example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$data = array(
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'one',
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'two',
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'three',
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'four',
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'five',
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'six',
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'seven',
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'eight',
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'nine',
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'ten',
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);
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$db = sqlite_open(':memory:');
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sqlite_query($db, "CREATE TABLE strings(a)");
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foreach ($data as $str) {
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$str = sqlite_escape_string($str);
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sqlite_query($db, "INSERT INTO strings VALUES ('$str')");
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}
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function max_len_step(&$context, $string) {
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$string = sqlite_udf_decode_binary($string);
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if (strlen($string) > $context) {
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$context = strlen($string);
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}
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}
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function max_len_finalize(&$context) {
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return $context;
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}
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sqlite_create_aggregate($db, 'max_len', 'max_len_step', 'max_len_finalize');
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var_dump(sqlite_array_query($db, 'SELECT max_len(a) from strings'));
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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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<para>
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See also <function>sqlite_udf_encode_binary</function>,
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<function>sqlite_create_function</function> and
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<function>sqlite_create_aggregate</function>.
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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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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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