How to write a condition in ModX?

Question

PHP

I need a condition, if the
field is empty, then display , and if it is filled, then display
in php, everything is clear, but I can’t figure it out at all

Answer 1

As an option - do it through input-output modifiers, see docs.modx.pro/system/the-basics/filters-input-and-...
Specifically, in your case, as I understand it, this is for meta tags, it will be So:

<meta name="description" content=""/>

Answer 2

https://rtfm.modx.com/extras/revo/if

Answer 3

Suddenly, someone still hasn’t mastered the basics and will come across here from Google))
It can be even more convenient:
One of three fields will be used in descending order of precedence:

1. description field
   
2. longtitle field
   
3. pagetitle field
   

Answer 4

It seems to me that the code would be neater like this:

<meta name="description" content=""/>
// или 
<meta name="description" content="Вопрос">

Why write footcloths?