SQLite3::createFunction
(PHP 5 >= 5.3.0, PHP 7)
SQLite3::createFunction — Registers a PHP function for use as an SQL scalar function
说明
$name ,
mixed $callback [,
int $argument_count = -1 [,
int $flags = 0 ]] ) :
bool
Registers a PHP function or user-defined function for use as an SQL scalar function for use within SQL statements.
参数
-
name -
Name of the SQL function to be created or redefined.
-
callback -
The name of a PHP function or user-defined function to apply as a callback, defining the behavior of the SQL function.
This function need to be defined as:
-
value1 -
The first argument passed to the SQL function.
-
... -
Further arguments passed to the SQL function.
-
-
argument_count -
The number of arguments that the SQL function takes. If this parameter is -1, then the SQL function may take any number of arguments.
-
flags -
A bitwise conjunction of flags. Currently, only
SQLITE3_DETERMINISTICis supported, which specifies that the function always returns the same result given the same inputs within a single SQL statement.
返回值
Returns TRUE upon successful creation of the function, FALSE on failure.
更新日志
| 版本 | 说明 |
|---|---|
| 7.1.4 | The flags parameter has been added. |
范例
Example #1 SQLite3::createFunction() example
<?php
function my_udf_md5($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")'));
?>
以上例程的输出类似于：
string(32) "098f6bcd4621d373cade4e832627b4f6"
