Invalid indentation - tabs and spaces cannot be mixed

Description

Since PHP 7.3, HEREDOCS and NOWDOCS syntax allows the text to be indented by the same amount than the closing tag (here X). The indentation must be built with only spaces or only tabulations, and cannot be a mix of both.

Example

<?php

$x = <<<X
       classic text
      X // one tabulation + one space

?>

Solutions

• Make the indentation spaces only.

• Make the indentation tabulations only.