Gravity Forms: Replace the submit <input> with a <button>

functions.php

/**
 * Gravity Forms: Filters the submit button.
 * Replaces the <input> button with a <button> while maintaining attributes from original <input>.
 *
 * @param string $button Contains the <input> tag to be filtered.
 * @param object $form Contains all the properties of the current form.
 *
 * @return string The filtered button.
 * 
 * GF provides sample code for doing this under Examples at the following link but this dodn't work in my environment.
 * https://docs.gravityforms.com/gform_submit_button/
 */
add_filter(
	'gform_submit_button',
	function ( $button, $form ) {
		$button_xml        = simplexml_load_string( $button );
		$button_attributes = '';
		$button_text       = 'Submit';

		// combine the existing button attributes into a new string
		foreach ( $button_xml->Attributes() as $key => $value ) :
			// exclude the "type" and "value" attributes
			if ( $key !== 'type' && $key !== 'value' ) :
				$button_attributes .= sprintf( ' %s=\'%s\'', $key, $value );
			endif;

			// store the "value" attributes value
			if ( $key === 'value' ) :
				$button_text = $value;
			endif;
		endforeach;

		$new_button = sprintf( '<button %s>%s</button>', $button_attributes, $button_text );

		return $new_button;
	},
	10,
	2
);