Re: [PHP] Newbie question about good coding practice [isset]

[K.Bogac Bokeer]

When $var is 0?
?
  $var = 0;
  // Output: $var: $var not exists
  if ( $var )
echo '$var: $var existsbr';
  else
echo '$var: $var not existsbr';
  // Output: isset(): var exists
  if ( isset($var) )
echo 'isset(): $var existsbr';
  else
echo 'isset(): $var not existsbr';
?
Larry E . Ullman wrote:
if($var) do something;
verses
if(isset($var)) do something;
The simple form if($var) seems to work fine and I see it in code often.
Is there a good reason for using isset?

Yes, if you don't use isset(), you may see notices (errors) if the 
variable is not set. This depends upon the error reporting settings of 
the server. However, if you use isset() you won't see notices regardless.

Larry
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[PHP] Re: Understanding sessions

[K.Bogac Bokeer]

You can use

$sid = session_name().'='.session_id();

instead of SID or you can define o constant

define('SID', session_name().'='.session_id());

at the start of script ( after session_start() ).

Todd Cary wrote:
I am trying to understand sessions are done with php.  My learning 
script has the following:

  session_start();
  if (isset($_SESSION['firstname'])) {
$_SESSION['firstname'] = 'Todd';
  } else {
$_SESSION['firstname'] = 'Nobody';
  }
  echo SESSION:  . $_SESSION['firstname'] . br;
  echo 'SID: ' . SID . 'br';
  echo 'br /a href=page_2.php?' . SID . 'page 2/a';
SID is always empty.  What have I missed?

Todd
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[PHP] Re: combining variables...

[K.Bogac Bokeer]

$i   = 2;
$var = view_request_$i;
$value = $$var;
Tristan Pretty wrote:
Simply put, can I connect 2 variables, to make one...

I want to output:
$view_request_$i
making for example a string:
view_all_2
But I'm getting errors..?
Parse error: parse error in /home/risk/public_html/download/results3.php 
on line 675

is there a simple explination...?

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[PHP] Re: Wrong IP address

[K.Bogac Bokeer]

I'm using this one:

function FetchIP() {

 $client_ip   = $_SERVER['HTTP_CLIENT_IP'];
 $x_forwarded_for = $_SERVER['HTTP_X_FORWARDED_FOR'];
 $remote_addr = $_SERVER['REMOTE_ADDR'];
 if ( !empty ($client_ip) ) {
  $ip_expl = explode('.',$client_ip);
  $referer = explode('.',$remote_addr);
  if($referer[0] != $ip_expl[0]) {
   $ip=array_reverse($ip_expl);
   $return=implode('.',$ip);
  } else {
   $return = $client_ip;
  };
 } elseif ( !empty($x_forwarded_for) ) {
  if(strstr($x_forwarded_for,',')) {
   $ip_expl = explode(',',$x_forwarded_for);
   $return = end($ip_expl);
  } else {
   $return = $x_forwarded_for;
  };
 } else {
  $return = $remote_addr;
 };
 unset ($client_ip, $x_forwarded_for, $remote_addr, $ip_expl);
 return $return;
}
Ascll wrote:
Greetings,

I make use of these: -

?php
echo($_SERVER[REMOTE_ADDR]);
?
to get the web IP address for my machine once my PC is connected to
Internet..
Anyway, sometime I get the correct IP address, but sometime NOT.

Does anyone know why?

Thanks in advance.
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[PHP] Re: Relative Url

[K.Bogac Bokeer]

I'm using this on Apache. You need to include 'inc/globals.php' in your 
script.

inc/globals.php
?
require_once('functions.php');
define('RELPATH', GetRelativePath());
?
inc/functions.php

function GetRelativePath() {

$RELPATH = str_replace(UpDirectory(__FILE__), '', 
dir_name($_SERVER['SCRIPT_NAME]));
$RELPATH = substr_count($RELPATH, '/');

if ( $RELPATH0 )
$RELPATH = str_repeat('../', $RELPATH);
else
$RELPATH = '/';
return ConvertSlashes($RELPATH);
}
function UpDirectory($directory, $level=1) {

while ( $level--  0 )
$directory = dirname(dirname($directory));
return ConvertSlashes($directory);
}
function ConvertSlashes($st) {

$st = str_replace('', '/', $st);
$st = str_replace('\\', '/', $st);
return $st;
}
function dir_name($directory) {

return ConvertSlashes(dirname($directory));
}
Chris Thomas wrote:
Is there anyway that i can get a url relative to my server for a script that
is being run??
The script is being included in mulitple files and $_SERVER['SCRIPT_NAME']
just gives me the name of the file that is including the other scripts.
Also $_SERVER['SCRIPT_FILENAME'] is returning nothing.
Thanks

Chris
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