Empty and Isset distinguish toner empty running on empty textutils.isempty

These two functions have not been very understanding, write a small program to deepen understanding!

 
 PHP/* * Isset-detects if the variable is  set *    returns TRUE if the variable exists, otherwise false**    empty  -checks if a variable is empty *    if Variable is a non-null or nonzero value, empty () returns false**/$is _var = '; if (isset($is _var)) {    echo "variable exists!)
The"else  {    echo " variable does not exist!
";} if (Empty ($is _var)) {    echo "variable is blank!)
The"else  {    echo " variable is not empty!
";}? >

Output Result:

Variable exists!
The variable is empty!

The above introduces the difference between empty and isset, including the contents of empty, I hope that the PHP tutorial interested in a friend helpful.

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