(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.
nameName of the SQL function to be created or redefined.
callbackThe 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:
valueThe first argument passed to the SQL function.
valuesFurther 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 | 說(shuō)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")'));
?>
以上例程的輸出類(lèi)似于：
string(32) "098f6bcd4621d373cade4e832627b4f6"