Blocking spaces

[Username:]

How can I block a text that contains only spaces?

Right now I have done

 

if ($body == "") {
die("<font color='red'><font size='15'><strong><center>Your post did not contain any text!");
}

 

But that's extremely insufficient, as any user can easily post "        "

Any ideas?

[Pikachu2000]

$var = trim($var);

if(strlen($var) == 0) {

    // only spaces were in $var

}

[Username:]

$var = trim($var);

if(strlen($var) == 0) {

    // only spaces were in $var

}

 

Works great, thanks!