Hey community,
I have tried this tutorial with select-fields and it works fine in PHP5.6:
http://www.advancedcustomfields.com/resources/creating-wp-archive-custom-field-filter/
But when I switch to PHP7 I get the following error message:
( ! ) Fatal error: Uncaught Error: [] operator not supported for strings in /app/public/wp-content/themes/test/functions.php on line 788
It refers to this section:
$meta_query[] = array(
'key' => $name,
'value' => $value,
'compare' => 'IN',
);
It seems that PHP7 doesn’t tolerate the brackets, but unfortunately I have no idea how to change that.
Does anyone have any idea why?
Best
Matthias
Is $meta_query already defined before this line?
If no try
$meta_query = array(
array(
'key' => $name,
'value' => $value,
'compare' => 'IN',
)
);
Thanks John. This was very helpful. Now I get related cpt posts without Errors or Warnings.
What do you mean by that?
Is $meta_query already defined before this line?
Should I have defined this more clearly?
// get meta query
$meta_query = $query->get('meta_query');
When you do something like this
$array[] = 'value';
You are adding a value to an array. This assumes that the array already exists. PHP would go ahead and create the array. PHP7.2 is a little more strict, at least I think that is what was happening. So what you need to do is
$array = array();
$array[] = 'value';
Or in the example I gave above, create the array with the first value at the same time
$array = array('value');
John, thank you very much for your explanation!
