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test for NULL

Posted on 2011-09-08
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Last Modified: 2012-05-12
How do you test for a null value in php?

The following statement seems to be failing:

if (  $var !="NULL" )  

0
Comment
Question by:pillmill
3 Comments
 
LVL 82

Accepted Solution

by:
hielo earned 500 total points
ID: 36505130
For EQUAL:
if( $var === NULL )
{
 ...
}

OR
if( is_null($var) )
{
...
}


For NOT EQUAL:
if( $var !== NULL )
{
 ...
}

OR
if( !is_null($var) )
{
...
}
0
 

Expert Comment

by:ajkukla
ID: 36505190
http://www.php.net/manual/en/function.is-null.php

if (is_null($var)) {
   //do something
}
0
 
LVL 83

Expert Comment

by:Dave Baldwin
ID: 36505470
I think @hielo gave all the variations.  The reason your version is failing is because the quotes make it a text string and not the named constant NULL.
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