在PHP中输出可能包含或不包含任何内容的变量的最佳实践是什么？

I am developing an application and want to display a form that will be filled in if editing the form, but will not be if the form will be a new entry. I believe the least verbose way of doing this is to have just one form and to suppress any errors for echoing my variables so that nothing will be printed if it is a new form (since the variables will not exist if it is a new form). For example:I am developing an application and want to disp