CODEWITHSUNDEEP
phpwordpresswidgetqr-code
Keith Gadberry
Keith Gadberry

Reputation: 174

Wordpress QR Code Widget

Basically, I've been trying to make a simple Wordpress widget that displays a QR code with the URL of the current page. I'm using a modififed version of the simple text widget that parses PHP too.

function the_qrcode($permalink = '', $title = '') {
    if($permalink && $title == '') {
        $permalink = 'http://eternityofgamers.com/forums';
        $title = 'Forums';
    }

    echo '<img src="http://api.qrserver.com/v1/create-qr-code/?data=' .$permalink. '" alt="QR: ' .$title. '"/>;
}

Can someone tell me what's wrong with this? I get a 500 error when I add it to functions.php.

Upvotes: 0

Views: 316

Answers (2)

Bailey Parker
Bailey Parker

Reputation: 15905

You will need to use the urlencode() function. Generally as a rule of thumb all querystring values should be url encoded.

function the_qrcode( $permalink = '' ) {
    if($permalink == '') {
        $permalink = 'http://eternityofgamers.com/forums';
    }

    echo '<img src="http://api.qrserver.com/v1/create-qr-code/?data='.urlencode($permalink);
}

Now you can create your QR code with:

the_qrcode(the_permalink());

Also, you had a very bad missing equals sign. It is very important to understand the difference between = and ==. If you don't, no matter the context = and == mean two different things. = assigns the right hand side to the left. == returns true or false whether the left and right hand side are loosely equal (loosely because casting will be used if the sides are not of the same type).

Look at this example (Codepad demo):

$a = 5;
$b = 10;

if($a = 6) {
    echo "This always appears because when you assign a truthy (all non-zero numbers are true) to a variable, true is returned.\n";
    echo "Also a should now equal six instead of five: " . $a . "\n";
}

if($b == 10) {
    echo "This will work as expected because == is a comparison not an assignment.\n";
    echo "And b should still be 10: " . $b;
}

Upvotes: 1

Shoe
Shoe

Reputation: 76280

Try with:

<?php
    function the_permalink( $permalink ) {
        if ($permalink == '') {
            echo '<img src="http://api.qrserver.com/v1/create-qr-code/?data=http://eternityofgamers.com/forums" alt="QR Code">';
        } else {
            echo '<img src="http://api.qrserver.com/v1/create-qr-code/?data='.$permalink;
        }
    }
?>

(I've corrected a bunch of syntax errors)

Upvotes: 0

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