Warning: Undefined variable $empty_string1 in /in/Y6Mcf on line 2
string(16) "non-empty string"
Warning: Undefined variable $empty_string2 in /in/Y6Mcf on line 3
string(16) "non-empty string"
Notice: Undefined variable: empty_string1 in /in/Y6Mcf on line 2
string(16) "non-empty string"
Notice: Undefined variable: empty_string2 in /in/Y6Mcf on line 3
string(16) "non-empty string"