[PHP] test variable value?
Hello What is the best way to determine if a variable has no value? if ($var= '') or if ($var= 'null') Can 'null' be used here? Thanks -Willa -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] test variable value?
Hello What is the best way to determine if a variable has no value? if ($var== '') or if ($var== 'null') Can 'null' be used here? Thanks -Willa -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] test variable value?
William Stokes wrote:
Hello
What is the best way to determine if a variable has no value?
if ($var== '')
or
if ($var== 'null')
Can 'null' be used here?
yeah buts its a string which doesn't do what you want.
if (empty($var)) { echo 'yes'; }
or:
if (is_null($var)) { echo 'yes'; }
Thanks
-Willa
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Re: [PHP] test variable value?
William Stokes wrote: Hello What is the best way to determine if a variable has no value? if ($var== '') or if ($var== 'null') Can 'null' be used here? Depends what you mean by no value. I suggest you read http://php.net/is_null, http://php.net/empty and http://php.net/isset. -Stut -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] test variable value?
How about...
if (!$x){
echo x is empty;
}
Regards,
Rodolfo Andradee
- Original Message -
From: Stut
To: William Stokes
Cc: php-general@lists.php.net
Sent: Wednesday, January 11, 2006 8:08 AM
Subject: Re: [PHP] test variable value?
William Stokes wrote:
Hello
What is the best way to determine if a variable has no value?
if ($var== '')
or
if ($var== 'null')
Can 'null' be used here?
Depends what you mean by no value. I suggest you read
http://php.net/is_null, http://php.net/empty and http://php.net/isset.
-Stut
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Re: [PHP] test variable value?
Rodolfo Andrade wrote:
How about...
if (!$x){
echo x is empty;
}
Because $x could be an empty string, 0, false, null or undefined. If
that's what you need to check for then knock yourself out.
-Stuart
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Re: [PHP] test variable value?
I do use if(!$var) for simple application. Only _IF_ I need to know if the
$var is defined but empty or so I would use especific functions.
- Original Message -
From: Stut
To: Rodolfo Andrade
Cc: William Stokes ; php-general@lists.php.net
Sent: Wednesday, January 11, 2006 11:49 AM
Subject: Re: [PHP] test variable value?
Rodolfo Andrade wrote:
How about...
if (!$x){
echo x is empty;
}
Because $x could be an empty string, 0, false, null or undefined. If
that's what you need to check for then knock yourself out.
-Stuart
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Re: [PHP] test variable value?
remember though that
if(!$x) {
echo 'nothing here';
}
will also output 'nothing here' when provided with the string '0'!
- tul
Rodolfo Andrade wrote:
I do use if(!$var) for simple application. Only _IF_ I need to know if the
$var is defined but empty or so I would use especific functions.
- Original Message -
From: Stut
To: Rodolfo Andrade
Cc: William Stokes ; php-general@lists.php.net
Sent: Wednesday, January 11, 2006 11:49 AM
Subject: Re: [PHP] test variable value?
Rodolfo Andrade wrote:
How about...
if (!$x){
echo x is empty;
}
Because $x could be an empty string, 0, false, null or undefined. If
that's what you need to check for then knock yourself out.
-Stuart
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Re: [PHP] test variable value?
Gerry Danen wrote:
On 1/11/06, M. Sokolewicz [EMAIL PROTECTED] wrote:
remember though that
if(!$x) {
echo 'nothing here';
}
will also output 'nothing here' when provided with the string '0'!
That's because (!$x) means ($x == false) and '0' is false...
Gerry
I know that, and you know that, as do others who have encountered
problems with this before; just wanted to make a small warning so the OP
wouldn't get hit by this
- tul
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Re: [PHP] test variable value?
On 1/11/06, M. Sokolewicz [EMAIL PROTECTED] wrote:
remember though that
if(!$x) {
echo 'nothing here';
}
will also output 'nothing here' when provided with the string '0'!
That's because (!$x) means ($x == false) and '0' is false...
Gerry
