Closing php tag and corrupted excel files

Need to get rid of php closing tags.

Recommended case study and related documentation: https://www.php.net/basic-syntax.phptags https://www.php.net/basic-syntax.instruction-separation https://stackoverflow.com/questions/4410704/why-would-one-omit-the-close-tag#:~:text=The%20reason%20you%20should%20leave,not%20add%20extra%20white%2Dspace. https://gulvi.com/serie/trucos-php/capitulo/por-que-no-poner-etiqueta-cierre-php