call php function in js

Question

i need to call php func in js with pass parameter(js variable) to func:
this worked:
let fulld = "<?= gregorian_to_jalali('2023', '10', '2', '/'); ?>";
but for this i got syntax error: syntax error, unexpected token ";"
let year = date.getFullYear();
let fulld = "<?= gregorian_to_jalali(?>"+year+"<?, '10', '2', '/'); ?>";

what is problem?

Answer 1

Write php inside this <?php ?>

you cannot use JavaScript variable in Php script