gw-populate-years-into-dropdown

<?php
/**
* Use this snippet to populate a Gravity Forms dropdown with years as choices, starting with the current year
* By default, the snippet will return four years, including the current year
* For example, the current year is 2023, so the dropdown choices would be 2023, 2024, 2025, 2026
* You will need to add the css class "populate-years" to the dropdown
*/

// Change 123 to your form ID
add_filter( 'gform_pre_render_123', 'populate_posts' );
add_filter( 'gform_pre_validation_123', 'populate_posts' );
add_filter( 'gform_pre_submission_filter_123', 'populate_posts' );
add_filter( 'gform_admin_pre_render_123', 'populate_posts' );
function populate_posts( $form ) {
 
    foreach ( $form['fields'] as &$field ) {
 
        if ( $field->type != 'select' || strpos( $field->cssClass, 'populate-years' ) === false ) {
            continue;
        }
 
        $choices = array();
	$i = 1;
	$year = date("Y");
 
        while ( $i <= 4 ) { // Change 4 to the number of years you wish to populate
		$choices[] = array( 'text' => $year, 'value' => $year );
		$year++;
		$i++;
        }
        
        $field->choices = $choices;
 
    }
 
    return $form;
}