(PHP 5 >= 5.3.0, PHP 7, PHP 8)

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


public SQLite3::createFunction(
    string $name,
    callable $callback,
    int $argCount = -1,
    int $flags = 0
): bool

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

Elenco dei parametri


Name of the SQL function to be created or redefined.


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

This function need to be defined as:

callback(mixed $value, mixed ...$values): mixed

The first argument passed to the SQL function.


Further arguments passed to the SQL function.


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


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.

Valori restituiti

Returns true upon successful creation of the function, false on failure.

Log delle modifiche

Versione Descrizione
7.1.4 The flags parameter has been added.


Example #1 SQLite3::createFunction() example

function my_udf_md5($string) {

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

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

Il precedente esempio visualizzerĂ  qualcosa simile a:

string(32) "098f6bcd4621d373cade4e832627b4f6"

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User Contributed Notes 2 notes

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


= 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)
"Failed creating function\n");

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

11 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:

(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:

function sqlite3_to_ascii($str, $charset = 'UTF-8')
// Don't process empty strings
if (!trim($str))

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


$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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