Question

If have a piece of code that gets some data from a sql database

$comms = $row['comments'] ; 

if ($comms != "") {
  $tooltip = "<b>Notes :</b> $comms </br>  ";  
}

What i want to do is display the result ONLY if there is something in the data. I am using the if statement to determine if $comms has any data in it but everything i try (“” ” ” 0 false) returns true. What is the value of nothing when returned (Although I have not included all the code I assure you that there is a value returned in $comms)

Any help would be great , thanks

Answer 1

if (!empty($comms)) {
  $tooltip = "<b>Notes :</b> $comms </br>  ";  
}

See http://php.net/manual/en/function.empty.php

If you are likely to get a value from the database that contains only whitespaces (I doubt it, but anyway), you will want to trim that variable first:

$comms = trim($comms);
if (!empty($comms)) {
  $tooltip = "<b>Notes :</b> $comms </br>  ";  
}

In response to @anthares comment (from the manual):

The following things are considered to
be empty:

• “” (an empty string)
• 0 (0 as an integer)
• “0” (0 as a string)
• NULL
• FALSE
• array() (an empty array)
• var $var; (a variable declared, but without a value in a class)