src/core/class-papi-core-conditional-rules.php
public function setup_filters() {
		add_filter( 'papi/conditional/rule/=', [$this, 'rule_equal'] );
		add_filter( 'papi/conditional/rule/!=', [$this, 'rule_not_equal'] );
		add_filter( 'papi/conditional/rule/>', [$this, 'rule_greater_then'] );
		add_filter( 'papi/conditional/rule/>=', [$this, 'rule_greater_then_or_equal'] );
		add_filter( 'papi/conditional/rule/<', [$this, 'rule_less_then'] );
		add_filter( 'papi/conditional/rule/<=', [$this, 'rule_less_then_or_equal'] );
		add_filter( 'papi/conditional/rule/IN', [$this, 'rule_in'] );
		add_filter( 'papi/conditional/rule/NOT IN', [$this, 'rule_not_in'] );
		add_filter( 'papi/conditional/rule/LIKE', [$this, 'rule_like'] );
		add_filter( 'papi/conditional/rule/BETWEEN', [$this, 'rule_between'] );
		add_filter( 'papi/conditional/rule/NOT BETWEEN', [$this, 'rule_not_between'] );
		add_filter( 'papi/conditional/rule/EXISTS', [$this, 'rule_exists'] );
		add_filter( 'papi/conditional/rule/NOT EXISTS', [$this, 'rule_not_exists'] );
		add_filter( 'papi/conditional/rule/EMPTY', [$this, 'rule_empty'] );
		add_filter( 'papi/conditional/rule/NOT EMPTY', [$this, 'rule_not_empty'] );
	}
public function setup_filters() {
		add_filter( 'papi/conditional/rule/=', [$this, 'rule_equal'] );
		add_filter( 'papi/conditional/rule/!=', [$this, 'rule_not_equal'] );
		add_filter( 'papi/conditional/rule/>', [$this, 'rule_greater_then'] );
		add_filter( 'papi/conditional/rule/>=', [$this, 'rule_greater_then_or_equal'] );
		add_filter( 'papi/conditional/rule/<', [$this, 'rule_less_then'] );
		add_filter( 'papi/conditional/rule/<=', [$this, 'rule_less_then_or_equal'] );
		add_filter( 'papi/conditional/rule/IN', [$this, 'rule_in'] );
		add_filter( 'papi/conditional/rule/NOT IN', [$this, 'rule_not_in'] );
		add_filter( 'papi/conditional/rule/LIKE', [$this, 'rule_like'] );
		add_filter( 'papi/conditional/rule/BETWEEN', [$this, 'rule_between'] );
		add_filter( 'papi/conditional/rule/NOT BETWEEN', [$this, 'rule_not_between'] );
		add_filter( 'papi/conditional/rule/EXISTS', [$this, 'rule_exists'] );
		add_filter( 'papi/conditional/rule/NOT EXISTS', [$this, 'rule_not_exists'] );
		add_filter( 'papi/conditional/rule/EMPTY', [$this, 'rule_empty'] );
		add_filter( 'papi/conditional/rule/NOT EMPTY', [$this, 'rule_not_empty'] );
	}
Setup filters.