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(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SQLite3::createFunction — Registers a PHP function for use as an SQL scalar function
$name,$callback,$argCount = -1,$flags = 0Registers a PHP function or user-defined function for use as an SQL scalar function for use within SQL statements.
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:
value
The first argument passed to the SQL function.
values
Further arguments passed to the SQL function.
argCount
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.
Returns true upon successful creation of the function, false on failure.
| 版本 | 说明 |
|---|---|
| 7.1.4 |
The flags parameter has been added.
|
示例 #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"
