Issue: PHP Warning: call_user_func() expects parameter 1 to be a valid callback

Hello,

Here’s what I’ve got in the code:

<?php foreach( $fields as $fieldset => $contents ) :
			$fieldset_classes = isset( $contents['callback_args']['classes'] ) ? $contents['callback_args']['classes'] : array();
			$legend_classes = isset( $contents['callback_args']['legend_classes'] ) ? $contents['callback_args']['legend_classes'] : array();
		?>
		<fieldset <?php echo rtb_print_element_class( $fieldset, $fieldset_classes ); ?>>

			<?php if ( !empty( $contents['legend'] ) ) : ?>
			<legend <?php echo rtb_print_element_class( '', $legend_classes ); ?>>
				<?php echo $contents['legend']; ?>
			</legend>
			<?php endif; ?>

			<?php
				foreach( $contents['fields'] as $slug => $field ) {

					$callback_args = empty( $field['callback_args'] ) ? array() : $field['callback_args'];

					if ( !empty( $field['required'] ) ) {
						$callback_args = array_merge( $callback_args, array( 'required' => $field['required'] ) );
					}

					if ( !empty( $field['empty_option'] ) ) {
						$callback_args = array_merge( $callback_args, array( 'empty_option' => $field['empty_option'] ) );
					}

					<strong>call_user_func( $field['callback'], $slug, $field['title'], $field['request_input'], $callback_args );</strong>
				}
			?>
		</fieldset>
		<?php endforeach; ?>

The line which has call_user_func is the one where I’m getting an error.
Please see the following page, although it does not show any error on the console:
https://jaynepal.lu/booking/

• This reply was modified 4 years, 1 month ago by vkpsir.

Yes, there is no error message on the user screen while making a reservation, but the issue is recorded in the error log. Yes, I noticed the same warning for your reservation as well.