Where to put the code

Any time you add a custom PHP function to your site, insert it in the WPCode plugin for code snippets (recommended), a child theme's functions.php, or your custom plugin.

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If you insert PHP code using the WPCode plugin, ensure that the PHP Snippet is selected as the code type.

If you're unfamiliar with using WordPress filters, you can find more details in the WordPress docs.

Duplicating a function

If you are attempting to use the same function or hook multiple times, you can't just duplicate the code and change field ids. Using the same function name twice will result in fatal errors on your site. To avoid this issue, you must change the function name any time you use the same code more than once on your site.

The function name is typically in two places within the code and needs to be changed in both places it occurs. In this example, the function name "check_entry_count" would need to be changed to something unique like "check_entry_count2" or "check_formb_entry_count". As long as the function names are unique, you can use the same custom code multiple times.

add_action('frm_display_form_action', 'check_entry_count', 8, 3);
function check_entry_count($params, $fields, $form){
	global $user_ID;
	remove_filter('frm_continue_to_new', '__return_false', 50);

	if($form->id == 11 and !is_admin()){ //replace 5 with the ID of your form
		$count = FrmEntry::getRecordCount("form_id=". $form->id ." AND user_id=".$user_ID);
		if($count >= 1){ //change 2 to your entry limit
			echo 'This form is closed';
			
			add_filter('frm_continue_to_new', '__return_false', 50);
		}
	}
}