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How to differentiate isset and empty

Answers were Sorted based on User's Feedback



How to differentiate isset and empty ..

Answer / p .g .senthilkumar

isset -> this variable handling functions determine whether
a variable is set . It checks whether a variable is set
even though it is empty.

empty -> as the term itself has already given a sign that
it would related to something that's empty, this variable
handling functions determine whether a variable is empty.
It checks whether a variable has a value whether it's empty
string, zero(0), or not set at all.

Is This Answer Correct ?    36 Yes 1 No

How to differentiate isset and empty ..

Answer / 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);

Is This Answer Correct ?    21 Yes 2 No

How to differentiate isset and empty ..

Answer / rahul shelar

isset is used for checking whether variable is set or not
and empty checks whether it is empty

Is This Answer Correct ?    19 Yes 5 No

How to differentiate isset and empty ..

Answer / vijay

isset is used to check whether the variable is set or
not ...
where as empty is used to check whether variable contains a
value or not

Is This Answer Correct ?    12 Yes 1 No

How to differentiate isset and empty ..

Answer / techytech

0, "0",
NULL, FALSE and empty string,

for this value empty() will return TRUE

Is This Answer Correct ?    3 Yes 0 No

How to differentiate isset and empty ..

Answer / rafique

actually, !isset and empty are one and same thing...

Is This Answer Correct ?    2 Yes 31 No

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