You can use var_dump() instead of print_r() – you get the type and the value of the variable and it will also work when your variable holds FALSE or NULL.
print_r( false ); # doesn't output anything
var_dump( false ); # output: bool(false)
print_r( NULL ); # doesn't output anything
var_dump( NULL ); # output: NULL
If you have arrays or objects to inspect, you could use a plugin like Kint Debugger to format the output into a more readable format.
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