Difference between empty and isset; Difference between emptyisset

Difference between empty and isset; Difference between emptyisset

These two functions have never been very understandable. Write a small program to deepen understanding!

<? Php/*** isset-check whether the variable is set * If the variable exists, true is returned, otherwise, false ** empty is returned.-Check whether a variable is null. * If the variable is not null or a non-zero value, empty () returns false **/$ is_var = ''; if (isset ($ is_var) {echo "variable exists! <Br/> ";}else {echo" the variable does not exist! <Br/> ";} if (empty ($ is_var) {echo" variable is empty! <Br/> ";}else {echo" variable is not empty! <Br/> ";}?>

Output result:

Variable exists!
The variable is empty!