question about similar variable values

[vijdev]

are all of the following same, or some same or all different:

$variable=""

$variable=0

$variable=NULL

 

and which of the above will satisfy

if(empty($variable))

{

blah!;

}

 

[PFMaBiSmAd]

There's a table in the documentation that shows what is considered to be 'empty' - http://php.net/manual/en/types.comparisons.php

 

You could also just test each of those values using some code to see for yourself.

[rwwd]

Hi there Vijdev,

$variable=""; //Setting var as empty or setting it for later, quotes mean string
$variable=0//numerical value or can be boolean
$variable=NULL//Same as the top one, but useful for passing into functions as an optional paramter

 

and

and which of the above will satisfy

if(empty($variable))

{

echo "blah!";

}

 

The top one, and if nothing is sent into the last one, that can be construed as empty/not set.  Bearing in mind that isset() and empty() have similar uses - BUT empty checks to see if there is any value in the variable, this is useful to check session/cookie data etc.

 

Hope that helps a little.

 

Cheers,

Rw

[vijdev]

thanks rwwd and PFMaBiSmAd.

both your answers were great to help me!