php-doc-en/reference/sqlite/functions/sqlite-udf-encode-binary.xml

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<refentry id="function.sqlite-udf-encode-binary">
 <refnamediv>
  <refname>sqlite_udf_encode_binary</refname>
  <refpurpose>Encode binary data before returning it from an UDF</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <methodsynopsis>
   <type>string</type><methodname>sqlite_udf_encode_binary</methodname>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>sqlite_udf_encode_binary</function> applies a binary encoding
   to the <parameter>data</parameter> so that it can be safely returned from
   queries (since the underlying libsqlite API is not binary safe).
  </para>
  <para>
   If there is a chance that your data might be binary unsafe (e.g.: it
   contains a NUL byte in the middle rather than at the end, or if it has and
   <literal>0x01</literal> byte as the first character) then you must
   call this function to encode the return value from your UDF.
  </para>
  <para>
   PHP does not perform this encode/decode operation automatically as it would
   severely impact performance if it did.
  </para>
  <note>
   <para>
    Do not use <function>sqlite_escape_string</function> to quote strings
    returned from UDF's as it will lead to double-quoting of the data.  Use
    <function>sqlite_udf_encode_binary</function> instead!
   </para>
  </note>
  <para>
   See also <function>sqlite_udf_decode_binary</function>,
   <function>sqlite_escape_string</function>, 
   <function>sqlite_create_function</function> and
   <function>sqlite_create_aggregate</function>.
  </para>
 </refsect1>
</refentry>
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