Menu
Community /Pin to ProfileBookmark
@NogDogMay 28.2012 — #isset() returns false if the variable is not set at all or is set to NULL. In addition to those two cases, [B]![/B]empty() will return false if the variable is set but has a value of FALSE, 0, 0.0, or "" (empty string). Thus, for example, you need to be careful about using [b]![/b]empty() when testing for a numeric input where zero is a valid value.
Output:
isset vs !empty
Hello,
I am fairly new to PHP and I am creating a basic registration from. I was trying to use isset to check all the variables but without any luck. It seemed all I needed to go was use !empty instead of isset.
Any reason why isset would not work?
if ( (!empty($username)) && (!empty($email)) && (!empty($email2)) && (!empty($pass)) && (!empty($pass2)) )
{
// seems to work
// rest of code to validate
}
else
{
echo ‘please fill in all fields’;
}
Cheers.
Sign in
to post a comment4 Comments(s) ↴
0
@NogDogMay 28.2012 — #isset() returns false if the variable is not set at all or is set to NULL. In addition to those two cases, [B]![/B]empty() will return false if the variable is set but has a value of FALSE, 0, 0.0, or "" (empty string). Thus, for example, you need to be careful about using [b]![/b]empty() when testing for a numeric input where zero is a valid value.[code=php]
<pre><?php
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "not set:nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
$foo = null;
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "null:nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
$foo = false;
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "false:nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
$foo = 0;
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "0 (zero):nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
$foo = 1;
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "non-zero number:nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
$foo = '';
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "empty string:nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
$foo = 'string';
$notEmpty = (!empty($foo));
$isset = (isset($foo));
echo "string:nnotEmpty:";
var_dump($notEmpty);
echo "isset:";
var_dump($isset);
echo "n";
?></pre>
[/code]Output:
<i>
</i>not set:
notEmpty:bool(false)
isset:bool(false)
null:
notEmpty:bool(false)
isset:bool(false)
false:
notEmpty:bool(false)
isset:bool(true)
0 (zero):
notEmpty:bool(false)
isset:bool(true)
non-zero number:
notEmpty:bool(true)
isset:bool(true)
empty string:
notEmpty:bool(false)
isset:bool(true)
string:
notEmpty:bool(true)
isset:bool(true)