PHP If statements after X amount of lines dont work anymore

Dear i have around 100+ lines of PHP if statements <?php if ( osc_item_region() == 'XXX' || osc_item_region() == 'XXX') { ?>

In the end of the code, it does not work anymore (last 5 or so lines). Is there a maximum number of if statements for php? What might be causing the error? Im looking for X,y,Z and if yes > showing a page