[php] Twig ternary operator, Shorthand if-then-else

Support for the extended ternary operator was added in Twig 1.12.0.

  1. If foo echo yes else echo no:

    {{ foo ? 'yes' : 'no' }}
    
  2. If foo echo it, else echo no:

    {{ foo ?: 'no' }}
    

    or

    {{ foo ? foo : 'no' }}
    
  3. If foo echo yes else echo nothing:

    {{ foo ? 'yes' }}
    

    or

    {{ foo ? 'yes' : '' }}
    
  4. Returns the value of foo if it is defined and not null, no otherwise:

    {{ foo ?? 'no' }}
    
  5. Returns the value of foo if it is defined (empty values also count), no otherwise:

    {{ foo|default('no') }}
    

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