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Re:TIO: Try it online by pavelbr on Saturday July 15, 2017 @05:30PM (#14779072)
It's actually quite simple: 'options' are command line options that you can supply, I don't know PHP but for Ruby it might be `-p` for example. Header and Footer are just glued to the code by newlines.
Re:TIO: Try it online by lucb1e on Saturday July 15, 2017 @09:44PM (#14780068)
Oh command line options. Then what are 'arguments', a little further below?
Re:TIO: Try it online by potato44 on Sunday July 16, 2017 @12:34AM (#14780493)
Options are what get passed to the interpreter. Arguments get passed to the program. How the interpreter gets called for most languages roughly goes like:

   interpreter options input.tio arguments
Where input.tio is the file containing the code.