无法使用MAMP连接到数据库

Question

I am trying to connect to a database with the name auth using PHP. I made the database with SequelPro and I am connecting using MAMP My PHP code is

$server = 'localhost';
$username = 'root';
$password = 'root';
$database = 'auth';

try {
    $conn = new PDO("mysql:host=$server;dbname=$database; $username, $password");
} catch(PDOException $e) {
    die("Connection failed ". $e->getMessage());

Answer 1

Your quote usage for the connection is incorrect and makes it so only 1 parameter is being sent to the PDO connection. Correct code:

$conn = new PDO("mysql:host=$server;dbname=$database;", $username, $password);

Simple demo ( https://eval.in/647408 ):

function simple($a, $b = 'empty', $c = 'empty') {
     var_dump('a=' . $a);
     var_dump('b=' . $b);
     var_dump('c=' . $c);
}
simple('a,b,c');
echo "\n" . 'version 2' . "\n\n";
simple('a','b','c');

Output:

string(7) "a=a,b,c"
string(7) "b=empty"
string(7) "c=empty"

version 2

string(3) "a=a"
string(3) "b=b"
string(3) "c=c"

With the commas in quotes they aren't read as parameter delimiters.