Newbie syntax question

[Thadeus]

Can someone tell me what the exclamation point in the following code does?
<code>
if (!isset($_SESSION['count'])) {
$_SESSION['count'] = 0;
} else {
$_SESSION['count']++;
}
</code>

 

[Thadeus]

BTW, I'm guessing that is means &quot;is not&quot;, but I can't find anything to document this.

 

[sleipnir214]

Metaphorically, you're right. It means &quot;not&quot; or &quot;is not&quot;.

For documentation:

http://www.php.net/manual/en/language.operators.logical.php

Want the best answers? Ask the best questions:

http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!

 

[Thadeus]

Thanks... I couldn't find it and didn't know what to search for, since 'NOT' and ! are not the best search terms.

Thadeus

 

[sleipnir214]

Just keep in mind that ! is an operator and start looking here:

http://www.php.net/manual/en/language.operators.php

Want the best answers? Ask the best questions:

http://www.catb.org/~esr/faqs/smart-questions.html

TANSTAAFL!!