It’s because if the user enters large="true"
, then $atts['small']
isn’t defined. The normal solution is to use shortcode_atts()
to set default values for the parameters, but you’re not putting the result of shortcode_atts()
into $atts
, you’re just just extracting it. This means that $small
will be defined, but $atts['small']
won’t be.
The proper way to solve this is to put shortcode_atts()
into a variable:
$atts = shortcode_atts( array(
'large' => false,
'small' => false,
'url' => ''
), $atts );
On a side note, it having a single size=""
attribute, with small
or large
as possible values, instead of separate attributes for each size, would probably be easier to manage.
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