--> "'. What do they serve?

[janhouse00]

Well, please take a look at the following line of code:

print '<a href="'. $HTTP_SERVER_VARS['PHP_SELF'] .'">Please try again</a>';

My question is: what's the purpose of putting those "'. in front and the end of the variable $HTTP_SERVER_VARS? Can't we just simply ignore them or something? And, what do FILE and LINE do? Thanks a lot.

[the_Igel]

When you write a href, you put it this way:

<a href="http://www.somewhere.com">SOMEWHERE</a>

You should put double quotes around the URL. That's the reason for double quotes.

Then, as you make a string for echoing, you use quotes:

$foo = 'bar';

In case you use single quotes and not double, you can't put a variable right into the string, so you have to concatenate strings:

$foo = 'bar'.$HTTP_SERVER_VARS['PHP_SELF'].'bar';

So single &amp; double quotes go in different roles in your example.

As for FILE &amp; LINE - they are constants (er, pseudo-constants, as they can change their values) that contain name of the file &amp; number of the line currently executing.

[janhouse00]

Thankz the_Igel