hi,

what is the Difference between isset() and empty() .

hi,
isset() - will tell you is a varaible has been defined. Sometimes it will return true even if the varable has an empty value.

empty() - check for the value is set for the variable. it returns true if the value is "0"

For some PHP type comparison please see this

PHP: PHP type comparison tables - Manual

__________________
With,
J. Jeyaseelan
Everything Possible

Isset() checks if a variable has a value including ( Flase , 0 , or Empty string) , But not NULL.
Returns TRUE if var exists; FALSE otherwise.

On the other hand the empty() function checks if the variable has an empty value empty string , 0, NULL ,or False. Returns FALSE if var has a non-empty and non-zero value.
Comparison example on both isset() and empty()
<?php
$var = 0;

// Evaluates to true because $var is empty
if (empty($var)) {
echo '$var is either 0, empty, or not set at all';
}

// Evaluates as true because $var is set
if (isset($var)) {
echo '$var is set even though it is empty';
}
?>
For more information and examples visit the following links.

PHP: isset - Manual

PHP: empty - Manual