Php/docs/sqlite3.createfunction

• PHP Manual
• SQLite3
• Registers a PHP function for use as an SQL scalar function

SQLite3::createFunction

(PHP 5 >= 5.3.0, PHP 7)

SQLite3::createFunction — Registers a PHP function for use as an SQL scalar function

说明

public SQLite3::createFunction ( string $name , mixed $callback [, int $argument_count = -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.

参数

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.

This function need to be defined as:

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

value

The first argument passed to the SQL function.

values

Further arguments passed to 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.

返回值

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

更新日志

版本	说明
7.1.4	The flags parameter has been added.

范例

Example #1 SQLite3::createFunction() example

<?phpfunction 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")'));?>

以上例程的输出类似于：

string(32) "098f6bcd4621d373cade4e832627b4f6"