# SQLite3::open

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SQLite3::open — Opens an SQLite database

### 说明

public SQLite3::open(string `$filename`, int `$flags` = SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE, string `$encryptionKey` = ""): void

Opens an SQLite 3 Database. If the build includes encryption, then it will attempt to use the key.

### 参数

`filename`

  Path to the SQLite database, or `:memory:` to use in-memory database.

`flags`

  Optional flags used to determine how to open the SQLite database. By default, open uses `SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE`.

  - `SQLITE3_OPEN_READONLY`: Open the database for reading only.

  - `SQLITE3_OPEN_READWRITE`: Open the database for reading and writing.

  - `SQLITE3_OPEN_CREATE`: Create the database if it does not exist.

`encryptionKey`

  An optional encryption key used when encrypting and decrypting an SQLite database. If the SQLite encryption module is not installed, this parameter will have no effect.

### 返回值

没有返回值。

### 示例

示例 #1 SQLite3::open() example

`<?php
/**
* Simple example of extending the SQLite3 class and changing the __construct
* parameters, then using the open method to initialize the DB.
*/
class MyDB extends SQLite3
{
function __construct()
{
$this->open('mysqlitedb.db');
}
}
$db = new MyDB();
$db->exec('CREATE TABLE foo (bar STRING)');
$db->exec("INSERT INTO foo (bar) VALUES ('This is a test')");
$result = $db->query('SELECT bar FROM foo');
var_dump($result->fetchArray());
?>`
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