Answer Posted / amit

isset() will ONLY return true when the value of the variable
is not NULL (and thereby the variable is at least defined).

empty() will return true when the value of the variable is
deemed to be an "empty" value, typically this means 0, "0",
NULL, FALSE and empty string, anything else is not empty.

Some examples


FALSE == isset($foo);
TRUE == empty($foo);
$foo = NULL;
FALSE == isset($foo);
TRUE == empty($foo);
$foo = 0;
TRUE == isset($foo);
TRUE == empty($foo);
$foo = 1;
TRUE == isset($foo);
FALSE == empty($foo);

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