Function to update all Gravity Forms 'State' dropdown field from full state name values to abbreviated state values.

functions.php

<?php
/**
 * Function to update all Gravity Forms 'State' dropdown field (based on field id #6), from full state name values to abbreviated state values if logged into the site.
 * Use once, then remove the code.
 */
function lstreng_update_all_gravity_forms() {
	// only load for admin panel
	if ( is_admin() ) {
		// load all forms
		$forms = GFAPI::get_forms();

		// loop through each form
		foreach ( $forms as $form ) {
			// loop through each field
			foreach ($form['fields'] as $field) {

				if ( $field->type != 'select' || $field->id != 6 ) {
					continue;
				}
				$states = array(
					array(
						'text'       => 'Alabama',
						'value'      => 'AL',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Alaska',
						'value'      => 'AK',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Arizona',
						'value'      => 'AZ',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Arkansas',
						'value'      => 'AR',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'California',
						'value'      => 'CA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Colorado',
						'value'      => 'CO',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Connecticut',
						'value'      => 'CT',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Delaware',
						'value'      => 'DE',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Florida',
						'value'      => 'FL',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Georgia',
						'value'      => 'GA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Hawaii',
						'value'      => 'HI',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Idaho',
						'value'      => 'ID',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Illinois',
						'value'      => 'IL',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Indiana',
						'value'      => 'IN',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Iowa',
						'value'      => 'IA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Kansas',
						'value'      => 'KS',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Kentucky',
						'value'      => 'KY',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Louisiana',
						'value'      => 'LA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Maine',
						'value'      => 'ME',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Maryland',
						'value'      => 'MD',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Massachusetts',
						'value'      => 'MA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Michigan',
						'value'      => 'MI',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Minnesota',
						'value'      => 'MD',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Mississippi',
						'value'      => 'MS',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Missouri',
						'value'      => 'MO',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Montana',
						'value'      => 'NE',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Nebraska',
						'value'      => 'NE',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Nevada',
						'value'      => 'NV',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'New Hampshire',
						'value'      => 'NH',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'New Jersey',
						'value'      => 'NJ',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'New Mexico',
						'value'      => 'NM',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'New York',
						'value'      => 'NY',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'North Carolina',
						'value'      => 'NC',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'North Dakota',
						'value'      => 'ND',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Ohio',
						'value'      => 'OH',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Oklahoma',
						'value'      => 'OK',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Oregon',
						'value'      => 'OR',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Pennsylvania',
						'value'      => 'PA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Rhode Island',
						'value'      => 'RI',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'South Carolina',
						'value'      => 'SC',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'South Dakota',
						'value'      => 'SD',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Tennessee',
						'value'      => 'TN',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Texas',
						'value'      => 'TX',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Utah',
						'value'      => 'UT',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Vermont',
						'value'      => 'VT',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Virginia',
						'value'      => 'VA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Washington',
						'value'      => 'WA',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'West Virginia',
						'value'      => 'WV',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Wisconsin',
						'value'      => 'WI',
						'isSelected' => false,
						'price'      => ''
					),
					array(
						'text'       => 'Wyoming',
						'value'      => 'WY',
						'isSelected' => false,
						'price'      => ''
					),
				);
				$choices = array();
				foreach ( $states as $state ) {
					$choices[] = array( 'text' => $state['text'], 'value' => $state['value'], 'isSelected' => $state['isSelected'], 'price' => $state['price'] );
				}

				$field->placeholder = 'Select a State';
				$field->choices = $choices;
			}
			// save form
			GFAPI::update_form( $form );
		}
	}
}
add_action( 'init', 'lstreng_update_all_gravity_forms', 99 );