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 bool SQLite3::createFunction ( string $name , mixed $callback [, int $argument_count = -1 ] )

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.
argument_count: The number of arguments that the SQL function takes. If this parameter is negative, then the SQL function may take any number of arguments.

返回值

Returns TRUE upon successful creation of the function, FALSE on failure.

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"