PHP error undefined variable notice how to fix?

Question

can somebody make sense of this? This code leaves an irritating "undefined variable" php Notice on my page. First I have this in my header in Wordpress. (BTW, I'm picking up another dev's code)

$head .= "
<link rel='profile' href='http://gmpg.org/xfn/11' />
<link rel='stylesheet' type='text/css' media='all' href='".get_bloginfo( 'stylesheet_url' )."' />
<link rel='pingback' href='".get_bloginfo( 'pingback_url' )."' />
";

ob_start();
wp_head();
$head .= ob_get_clean();

Then this line of code is included in a separate file. <?=$head;?> <--- What's this?

Removing this last line actually breaks parts of wordpress. I'm happy to leave it in but how do I remove the error Notice?

And what's happening in this code here? When I try to declare the $head variable like this:

$head = null;

It breaks everything.. I'm stumped. I know I need to leave it in. But I can't declare it. So php keeps up that notice. Ideas? Thanks.

can you add the complete code?? i mean where you are echoing the $head. — Niranjan N Raju
– Niranjan N Raju, Commented Nov 14, 2015 at 6:00
@NiranjanNRaju it's all in the head on this site. All of this is in the header.php file. Does that help? on this site safestoragedepot.com/blog — kevllar
– kevllar, Commented Nov 14, 2015 at 6:02
Your dev is a terrible dev that doesn't conform to the Wordpress php coding standards — dingo_d
– dingo_d, Commented Nov 14, 2015 at 6:29

doublesharp · Accepted Answer · 2015-11-14 08:59:34Z

2

Just remove the .= so that it is assigning a value to the $html rather than appending to it. You cannot append null to a string, which is why your second attempt failed. You could initialize it to an empty string, but it's an unnecessary extra step.

$head = "
<link rel='profile' href='http://gmpg.org/xfn/11' />
<link rel='stylesheet' type='text/css' media='all' href='".get_bloginfo( 'stylesheet_url' )."' />
<link rel='pingback' href='".get_bloginfo( 'pingback_url' )."' />
";

answered Nov 14, 2015 at 8:59

doublesharp

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1 Comment

kevllar Over a year ago

So the site is split up into two main areas. PHP and (Wordpress Env) the Blog. I ended up assigning the html to a new variable $html, replacing $head with $html in the wp header. Oddly enough I ended up deleting $head from the php header and now everything is fine. No more Notices and Wordpress is happy too. Thanks everyone!

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