PHP 7.2.0 Beta 3 Released

SQLite3::createFunction

(PHP 5 >= 5.3.0, PHP 7)

SQLite3::createFunctionRegisters a PHP function for use as an SQL scalar function

Description

public bool SQLite3::createFunction ( string $name , mixed $callback [, int $argument_count = -1 [, int $flags = 0 ]] )

Registers a PHP function or user-defined function for use as an SQL scalar function for use within SQL statements.

Parameters

name

Name of the SQL function to be created or redefined.

callback

The name of a PHP function or user-defined function to apply as a callback, defining the behavior of the SQL function.

argument_count

The number of arguments that the SQL function takes. If this parameter is -1, then the SQL function may take any number of arguments.

flags

A bitwise conjunction of flags. Currently, only SQLITE3_DETERMINISTIC is supported, which specifies that the function always returns the same result given the same inputs within a single SQL statement.

Return Values

Returns TRUE upon successful creation of the function, FALSE on failure.

Changelog

Version Description
PHP 7.1.4 The flags has been added.

Examples

Example #1 SQLite3::createFunction() example

<?php
function my_udf_md5($string) {
    return 
md5($string);
}

$db = new SQLite3('mysqlitedb.db');
$db->createFunction('my_udf_md5''my_udf_md5');

var_dump($db->querySingle('SELECT my_udf_md5("test")'));
?>

The above example will output something similar to:

string(32) "098f6bcd4621d373cade4e832627b4f6"

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User Contributed Notes 2 notes

up
3
koalay at gmail dot com
7 years ago
Since regular expression is not supported by default SQLite, we can create a user function to do the job.

<?php

$db
= new SQLite3("database.sqlit3", 0666);

// create a function named "preg_match"
// with the php core function "preg_match"
if ($db->createFunction("preg_match", "preg_match", 2) === FALSE)
  exit(
"Failed creating function\n");

// this query will then works as expected
$result = $db->query("SELECT * FROM table1 WHERE
  preg_match('/^(apple|orange)$/', variable1)"
);

?>
up
0
bohwaz
5 years ago
In PHP 5.4 there will be a createCollation method to use your custom collation method, to be able to sort datasets using unicode, like this:

<?php
setlocale
(LC_COLLATE, 'fr_FR.UTF-8');
$db->createCollation('PHP_COLLATE', 'strcoll');

$db->query('SELECT * FROM my_table ORDER BY name COLLATE PHP_COLLATE;');
?>

But until this cool feature becomes available, you'll have to do some tricks, like this for french:

<?php
function sqlite3_to_ascii($str, $charset = 'UTF-8')
{
   
// Don't process empty strings
   
if (!trim($str))
        return
$str;

   
// We only process non-ascii strings
   
if (preg_match('!^[[:ascii:]]+$!', $str))
        return
$str;

   
$str = htmlentities($str, ENT_NOQUOTES, $charset);

   
$str = preg_replace('#&([A-za-z])(?:acute|cedil|circ|grave|orn|ring|slash|th|tilde|uml);#', '\1', $str);
   
$str = preg_replace('#&([A-za-z]{2})(?:lig);#', '\1', $str);
   
$str = preg_replace('#&[^;]+;#', '', $str);

    return
$str;
}

$db->createFunction('to_ascii', 'sqlite3_to_ascii', 1);
$res = $db->query('SELECT * FROM test ORDER BY to_ascii(text);');
?>

This will convert non-ascii characters to ascii ones before collation. In fact this won't work with non-latin languages, but for latin-languages it's better than nothing.

Please note that this will slow down about 1.8 times the query (tested on a 10.000 rows table).
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