… using this code in
index.php the result is “null”
Since the code referenced is var_dump($input_examples); that means that $input_examples hasn’t been set or it out of scope where you are trying to use it. You will need to add …
$input_examples = get_option('price_display_options'); // maybe not the right key
… to your code before this line:
if( $input_examples['checkbox_contactprice'] == '1' ) {
I am guessing at the option name but you get the idea.
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