Catchable fatal error: Object of class db could not be converted to string

[Jon W]

Hello all. I ran into a error that I can't seem to figure out. This error is created from the mysql_select_db() function. All looks like it should work fine to me. So while I don't understand this maybe someone here will.

conn.php

PHP Code:

<?php
    $host = "localhost";
    $user = "user";
    $pass = "password";
    $db = "mydatabase";
?>

common.php

PHP Code:

<?php
    require("conn.php");
    require("db.php");
    $db = new db();
    
    $db->conn($host, $user, $pass, $db);
?>

db.php whcih is the class file.

PHP Code:

<?php
    class db {
            public function conn($host, $user, $pass, $db) {
                $con = mysql_connect($host, $user, $pass);
                if(!$con) {
                    die('Database Error. Failed to connect.');
                }
                
                $select_db = mysql_select_db($db, $con);
                if(!$select_db) {
                    die('Unable to select database.');
                }
            }
    }
?>

[PappaJohn]

$db = new db();
    
$db->conn($host, $user, $pass, $db);

You've named both the instance of your DB object, and a string variable holding the name of the database as $db. You'll need to change one of them.

What that error means is that the $db->conn function is expecting a string as the database name, but you are attempting to pass an object.

[Jon W]

Hehe... Oops. Thanks. :P

[kbluhm]

Originally Posted by PappaJohn

What that error means is that the $db->conn function is expecting a string as the database name, but you are attempting to pass an object.

That's not quite correct. It means you are attempting to convert an object to a string, but the object has no way of handling it. It has no __toString() magic method.