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This is a sample input form from wordpress standard coding (I get it from this page – http://codex.wordpress.org/Creating_Options_Pages)
<input type="text" name="new_option_name" value="<?php echo get_option('new_option_name'); ?>" />
When people insert the data in the form, the value will store in the function
<?php echo get_option('new_option_name'); ?>
My question is, how to get back the value to display the anywhere like index.php, sidebar.php so in can be viewed by the public.
Technically, you use the function
update_option('new_option_name','New option value');to store the data. You can use theget_option('new_option_name');function to access that data anywhere in WordPress (well, any time after the plugins have loaded, at least. Maybe sooner). So you can putecho get_option('new_option_name');anywhere in your theme and it will work as long as the option with the name ‘new_option_name’ actually exists.