[Solved] How to defined a variable on PHP? [closed]

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Clearly from the error can be read that the current index you are using for the array doesn’t exist.

$up_fonts[$font]['style'] is not set.

You haven’t defined your array enough. Check if the value exist with 

if (isset($up_fonts[$font]['style'])):
  $stylesheet = $up_fonts[$font]['style'];
endif;

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solved How to defined a variable on PHP? [closed]