从ID数据库打印条形码

Question

After my last barcode question i'm back with another. This barcode script: http://www.shayanderson.com/php/php-barcode-generator-class-code-39.htm works fine with a static number, or static variable:

$reparationid = uniqid();

// include Barcode39 class 
include "Barcode39.php"; 

// set Barcode39 object 
$barcode = new Barcode39("$reparationid"); 

// display new barcode 
$barcode->draw();

Bu, i want the $reparationID out of the database, the last added entry.i tried this, and it works without barcode:

$reparationid = "SELECT reparationid FROM reparation ORDER BY added DESC LIMIT 1";
$result = $link->query($reparationid);

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        print($row ["reparationid"]);
    }
}
else {
    echo "0 results";
}

as asked, the reparationid is shown as number, so it works. Now i wanted to merge those 2 scripts, but that is the point where it goes wrong. It doesn't work at all. I tried this:

if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        print($row ["reparatieid"]);

        // include Barcode39 class 
include "Barcode39.php"; 

       // set Barcode39 object 
$barcode = new Barcode39("$reparationid"); 

       // display new barcode 
$barcode->draw();

    }
}
else {
    echo "0 results";
}

There is a blue question mark, nothing more.. Any ideas?

Thanks,

Br, Daan

Answer 1

Tip: Don't include whilst in the while loop, move it above the loop.

Change your line to become;

$barcode = new Barcode39($row["reparationid"]);

$reparationid doesn't exist in the script you've given, and if it does; it doesn't have the value you fetched from the database. (It does have the value of your database query string though)