Exclude results of certain custom field value

You can try set the pre_get_post priority to more than 1000, as the plugin uses priority of 1000

Thanks for your reply. If I do this, the request is no more working…

Here is my piece of code :

https://pastebin.com/iBwtFEfu

Because the query is overrides by your meta query.
Another way is add the hidden field into the search form, by using awpqsf_addextra_cmf() hook.

Eg.

add_filter(‘awpqsf_addextra_cmf’,’hidden_cmf_field’,”,3);
function hidden_cmf_field($newcmf, $i,$id){
$excludekey = ”;//your exclude meta field key
$excludecompare = ‘2’;// 2 is the reference number for “!=”
$excludevalue = ”;//the meta value that you need to compare

echo ‘<input type=”hidden” name=”cmf[‘.$i.’][metakey]” value=”‘.$excludekey.'”>’;
echo ‘<input type=”hidden” name=”cmf[‘.$i.’][compare]” value=”‘.$excludecompare.'”>’;
echo ‘<input type=”hidden” name=”cmf[‘.$i.’][value]” value=”$excludevalue”>’;
}

Ok I did this:

add_filter('awpqsf_addextra_cmf','hidden_cmf_field','',3);
function hidden_cmf_field($newcmf, $i,$id){
$excludekey = 'Photos_0';//your exclude meta field key
$excludecompare = '2';// 2 is the reference number for "!="
$excludevalue = '';//the meta value that you need to compare

echo '<input type="hidden" name="cmf['.$i.'][metakey]" value="'.$excludekey.'">';
echo '<input type="hidden" name="cmf['.$i.'][compare]" value="'.$excludecompare.'">';
echo '<input type="hidden" name="cmf['.$i.'][value]" value="$excludevalue">';
}

But where should I put the form ID?

My bad it seems to works fine. The last line was missing quotes ??