In the comments, you show the following: $query = $db-query('SELECT MAX( Bestelnummer ) FROM Bestellingsdetail');$query-execute;$max = $query;$max;This is not how you get the result from a query. You are setting $max to a PDOStatement object. You need to fetch the result in order to use it. // I've added 'AS maxval' to make it easier to get the row$query = $db-query('SELECT MAX(Bestelnummer) AS maxval FROM Bestellingsdetail');$maxrow = $query-fetch(PDO::FETCHASSOC);$max = $maxrow'maxval';$max;Docs:P.S. $query-execute; is only needed for prepared statements. Query will execute the query immediately.

1. Object Of Class Html2fpdf Could Not Be Converted To Strings
2. Object Of Class Html2fpdf Could Not Be Converted To String Chords

#2521769 Object of class pocketmine Server could not be converted to string. Submitted by PocketMine-MP 3.8.0.

Object Of Class Html2fpdf Could Not Be Converted To Strings

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Object Of Class Html2fpdf Could Not Be Converted To String Chords

$mbdump = 'mysqldump '. $this - db - pass. $this - db - host. $this - db - user;$mbdump = ' -result-file='./packages/'.

$this - db - db. $tables;Firstly I think the second line here shouldn't be replacing the string we just created on the first line. Did you/someone rewrite this or it really potentially a decade old/presumably well tested?If you're sure the problem's on this second line, it would seem to be with the type of $this-db-db, because the other uses of $this-db worked, $tables is a string from the implode, $filename should be one too. I would seek the definition of $this-db-db and what you can do to get a useful string from it in this context.