gw-capitilize-multiple-fields.php

<?php

/**
* Save multiple fields in different forms as uppercase when form is submitted
*/

add_action( 'gform_pre_submission_123', function ( $form ) { // Change 123 to your first form ID
	
	$fields = array(2,9,12); // Enter your field IDs here, separated by commas. In this case it will apply to fields 2, 9 and 12
	
	foreach( $fields as $field ){
	
		$input_key           = sprintf( 'input_%s', $field );
		$_POST[ $input_key ] = strtoupper( rgpost( $input_key ) );
		
	}

	return $form;
} );

add_action( 'gform_pre_submission_456', function ( $form ) { // Change 456 to your second form ID
	
	$fields = array(5,7); // Enter your field IDs here, separated by commas. In this case it will apply to fields 5 and 7
	
	foreach( $fields as $field ){
	
		$input_key           = sprintf( 'input_%s', $field );
		$_POST[ $input_key ] = strtoupper( rgpost( $input_key ) );
		
	}

	return $form;
} );