当我输入connect（）到我的数据库时，我的localhost服务器出现空白

Is the connect() function depecrated or something? When I try to connect to a mysql database using that function, my page stops working? i'm doing jeffrey ways 30daysjquery course lesson 25

here's the code in my index.php file

<?php 
require 'functions.php'

if ( isset($_POST['q'])) {
    connect();
}

include 'views/index.tmpl.php' 

?>

This is my code in my functions.php file

<?php 

function connect(){
    global $pdo; // set it as global so other functions can access it
    $pdo = new PDO("mysql:host=localhost;dbname=sakila", "root", "root");
}

function get_actors (){

}
?>

Might it be that I do not have access to the content that's in functions.php? if it is how do I create access?

Your function should maybe return a connection:

function connect(){
    $pdo = new PDO("mysql:host=localhost;dbname=sakila", "root", "root");
    return $pdo;
}

Then, your function get_actors() could be

$db_connection = connect();
get_actors( $db_connection );


function get_actors( $pdo ) {
    //
    // You use the database connection $pdo to get actors
    //
}

You have to add a parameter to your function get_actors. No need to modify the code into the function.

When I checked MAMP this is the information I have if I want to connect to a MySQL server using a script.

Host    localhost
Port    8889
User    root
Password    root
Socket  /Applications/MAMP/tmp/mysql/mysql.sock

thrown in /Applications/MAMP/htdocs/lesson-25/functions.php on line 5
[09-Nov-2014 23:01:47 Europe/Berlin] PHP Fatal error:  Uncaught exception 'PDOException' with message 'could not find driver' in /Applications/MAMP/htdocs/lesson-25/functions.php:5
Stack trace:
#0 /Applications/MAMP/htdocs/lesson-25/functions.php(5): PDO->__construct('mysql:host=loca...', 'root', 'root')
#1 /Applications/MAMP/htdocs/lesson-25/functions.php(9): connect()
#2 /Applications/MAMP/htdocs/lesson-25/index.php(3): require('/Applications/M...')
#3 {main}