What Does This Php Code Do?

[Norman]

$pt2="http://$SERVER_NAME$SCRIPT_NAME";$pt2= substr($pt2,0,strlen($pt2)-21);

I don't understand completely this code. What does the first line do? And.. why it will need to specify the file name lenght (-21)? (http://www.plus2net.com/articles/php_newsletter_script.php)

[jlhaslip]

Try this code:

<?php$pt2="http://$SERVER_NAME$SCRIPT_NAME";echo $pt2 . '<br />';$pt2= substr($pt2,0,strlen($pt2)-21);echo $pt2 . '<br />';?>

The substr() finds a sub-string in a string from a starting point for a given length. In this case, starting at the first (0) character for a length of (string_length minus 21) characters.http://ca3.php.net/substr

[Norman]

Ok, I understand the second line. Now I still need to understand the first line. In my localhost I get this php error message:

Notice: Undefined variable: SERVER_NAME in C:\Programmi\EasyPHP 3.0\www\php-test\index.php on line 46

Why? I know I *should* set those two variables ($SERVER_NAME, $SCRIPT_NAME).. but, how?Maybe it should be like this..

$pt2="http://$_SERVER[SERVER_NAME]$_SERVER[SCRIPT_NAME]";

?

[jlhaslip]

Do you have the $_GLOBALS array available?

<?php$pt2="http://$SERVER_NAME$SCRIPT_NAME";echo '$SERVER_NAME :  ' . $SERVER_NAME . '<br />';echo '$SCRIPT_NAME :  ' . $SCRIPT_NAME . '<br />';echo $pt2 . '<br />';$pt2= substr($pt2,0,strlen($pt2)-21);echo $pt2 . '<br />';echo '<pre>';print_r( $GLOBALS );echo '</pre>';?>

Try that script to see what your output is. $SERVER and $SCRIPT_NAME are listed a $_GLOBALS on my output. (As well as in the $_SERVER array.)

[Norman]

Using that code I get this output.

Notice: Undefined variable: SERVER_NAME in C:\Programmi\EasyPHP 3.0\www\php-test\test.php on line 3Notice: Undefined variable: SCRIPT_NAME in C:\Programmi\EasyPHP 3.0\www\php-test\test.php on line 3Notice: Undefined variable: SERVER_NAME in C:\Programmi\EasyPHP 3.0\www\php-test\test.php on line 5$SERVER_NAME :Notice: Undefined variable: SCRIPT_NAME in C:\Programmi\EasyPHP 3.0\www\php-test\test.php on line 6$SCRIPT_NAME :http://Array( [GLOBALS] => Array *RECURSION* [_POST] => Array ( ) [_GET] => Array ( ) [_COOKIE] => Array ( [visits] => 56 ) [_FILES] => Array ( ) [pt2] => )

[boen_robot]

Maybe it should be like this..

$pt2="http://$_SERVER[SERVER_NAME]$_SERVER[SCRIPT_NAME]";

?

Close enough... it's more like:

$pt2="http://{$_SERVER['SERVER_NAME']}{$_SERVER['SCRIPT_NAME']}";

I don't see why would you want a code that stripts the last 21 characters from a URL though... still, I believe that is what this code is supposed to do. Where did you see it from anyway?