php-doc-en/reference/pdo_sqlite/PDO/sqliteCreateCollation.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="pdo.sqlitecreatecollation" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>PDO::sqliteCreateCollation</refname>
  <refpurpose>
   Registers a User Defined Function for use as a collating function in SQL statements
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>bool</type><methodname>PDO::sqliteCreateCollation</methodname>
   <methodparam><type>string</type><parameter>name</parameter></methodparam>
   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
  </methodsynopsis>
  &warn.experimental.func;
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>name</parameter></term>
     <listitem>
      <para>
       Name of the SQL collating function to be created or redefined.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>callback</parameter></term>
     <listitem>
      <para>
      The name of a PHP function or user-defined function to apply as a callback, defining the behavior of the collation. It should accept two strings and return as strcmp() does, i.e. it should return -1, 1, or 0 if the first string sorts before, sorts after, or is equal to the second.
      </para>
      <para>
       This function need to be defined as:
       <methodsynopsis>
        <type>int</type><methodname><replaceable>collation</replaceable></methodname>
        <methodparam><type>string</type><parameter>string1</parameter></methodparam>
        <methodparam><type>string</type><parameter>string2</parameter></methodparam>
       </methodsynopsis>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>PDO::sqliteCreateCollation</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$db = new PDO('sqlite::memory:');
$db->exec("CREATE TABLE test (col1 string)");
$db->exec("INSERT INTO test VALUES ('a1')");
$db->exec("INSERT INTO test VALUES ('a10')");
$db->exec("INSERT INTO test VALUES ('a2')");

$db->sqliteCreateCollation('NATURAL_CMP', 'strnatcmp');
foreach ($db->query("SELECT col1 FROM test ORDER BY col1") as $row) {
  echo $row['col1'] . "\n";
}
echo "\n";
foreach ($db->query("SELECT col1 FROM test ORDER BY col1 COLLATE NATURAL_CMP") as $row) {
  echo $row['col1'] . "\n";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
a1
a10
a2

a1
a2
a10
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    This method is not available with the SQLite2 driver.
    Use the old style sqlite API for that instead.
   </para>
  </note>
 </refsect1>
</refentry>

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