variable visibility when using <a href></a>

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hello world,

sorry if this is off topic, but the question arose when i was buidling 
a test system with PHP4 / postgresql.

i want a user to enter a user ID and password in order to make a non-
permanent database connection. so the application (that consistes of 
several PHP and HTML files) should remember the values in variables.

a logical approach seemed to be global variables, however, this doesn't 
work when new pages are generated. in this small example:

	// this is file main.php
	<?php
  	echo "<html><body>";
	  $password="fubar";
  	echo "password is: \"$password\"<br>";
	  echo "<a href='sub.php'>sub</a>";
  	echo "</body></html>";
	?>

	// this is file sub.php
	<?php
  	echo "<html><body>";
	  global $password; // doesn't work
  	echo "password is: \"$password\"<br>";
	  echo "</body></html>";
	?>

the variable $password is not visible in sub.php. i guess this is 
because the href link creates a new page, a fresh start. still i want 
$password to be visible in sub.php. what is a good, safe way to do 
this? setting serverside environment variables sounds dangerous. and i 
would like to avoid cookies (unless it's the only way). i thought about 
include_once(), but you can't call that from a link. or can you?

how is this normally done? TIA for any tips!

-- 
Jules Alberts


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