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<?php
/**
 * Gravity Perks // GP Read Only // Disable Read Only for Admins
 * http://gravitywiz.com/
 */
add_filter( 'gform_pre_render', function( $form ) {
    foreach( $form['fields'] as $field ) {
        if( gw_has_css_class( $field, 'gp-read-only-except-admin' ) && current_user_can( 'administrator' ) ) {
            $field->gwreadonly_enable = false;
        }
    }
    return $form;
} );

/**
 * Gravity Wiz // Gravity Forms // gw_has_css_class()
 *
 * A simple function to determine whether a form or field object has the specified CSS class.
 *
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravitywiz.com/...
 */
if( ! function_exists( 'gw_has_css_class' ) ) {
	function gw_has_css_class( $form_or_field, $class ) {
		if( ! isset( $form_or_field['cssClass'] ) ) {
			return false;
		} else {
			$classes = array_map( 'trim', explode( ' ', $form_or_field['cssClass'] ) );
			return in_array( $class, $classes );
		}
	}
}