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<?php

// standard usage
new GW_Submission_Limit( array(
    'form_id' => 86,
    'limit' => 2,
) );

// all options
new GW_Submission_Limit( array(
    'form_id' => 2,
    'limit' => 5,
    'time_period' => 60 * 60 * 24 * 2, // two days in seconds; also supports 'per_day', 'per_month', 'per_year'
    'limit_message' => 'You are all maxed out! Try again in a couple days.',
    'limit_by' => 'ip', // default is 'ip', also supports 'user_id', 'embed_url', 'role'; can alternately provide an array of limitations: array( 'ip', 'embed_url' )
) );

// apply to ALL forms
new GW_Submission_Limit( array(
    'limit' => 5
) );
    
// apply multiple limiters
new GW_Submission_Limit( array(
    'form_id' => 2,
    'limit' => 1,
    'limit_message' => 'Aha! You have been limited.',
    'limit_by' => array( 'embed_url', 'user_id' )
) );

// limit by roles
new GW_Submission_Limit( array(
    'form_id' => 2,
    'limit_by' => 'role',
    // when "limit_by" is set to "role", "limit" must be provided as array with roles and their corresponding limits
    'limit' => array(
        'administrator' => 20,
        'contributor' => 5
    )
) );

// limit by calendar time period
new GW_Submission_Limit( array(
    'form_id' => 3,
    'time_period' => 'per_month'
) );

// Limit by Field Value (with no time period)
new GW_Submission_Limit( array(
    'form_id' => 1,
    'limit_by' => 'field_value',
    'limit' => array(
        // "2" is your field ID, "6" is your limit for this field ID
        2 => 6 
    ),
    'time_period' => false  // forever!
) );

<?php

$safe_ips = array( '75.74.153.104', '127.0.0.1' );

if( is_callable( array( 'GFFormsModel', 'get_ip' ) ) && ! in_array( GFFormsModel::get_ip(), $safe_ips ) ) {

	# Global Limit Across ALL Forms
	new GW_Submission_Limit( array(
		'limit' => 1,
		'limit_message' => 'Aha! You have been limited.',
		'apply_limit_per_form' => false,
		'time_period' => 60 * 1,
		'enable_notifications' => true
	) );

	# Limit Applied to Specific Form
	new GW_Submission_Limit( array(
		'form_id' => 602,
		'limit' => 2,
		'limit_message' => 'Check it! No more for you.',
		'time_period' => 60 * 1,
		'enable_notifications' => true
	) );

}