Gravity Forms - Validation (Default Value = Fail)

snippet.php

<?php
// Gravity Forms Validation. Rejects any required input where $_POST value = default input value (ya, placeholders didn't use to exist!)
add_filter( 'gform_validation', 'mr_custom_validation' );
function mr_custom_validation( $validation_result ){
	$form = $validation_result['form'];
	foreach( $form['fields'] as &$field ){
		if( '1' == $field['isRequired'] && 'checkbox' != $field['type'] ) {
			if( $field['defaultValue'] == $_POST[ 'input_' . $field['id'] ] ) {
				$validation_result['is_valid']	= false;
				$field['failed_validation']	= true;
				$field['validation_message']	= "This field is invalid!";
			}
		}
	}
	$validation_result['form'] = $form;
	return $validation_result;
}