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<?php/* roll_call.php **************** * - if log-in * 	- take user-name/passphrase * 	- verify with database * 	- set session 'logged-in' state * - if log-out * 	- unset session 'logged-in' state * - if register * 	- take user-name / e-mail address / passphrase * 		- store uname/email/crypt(pass) * 		- mail authorization string to e-mail address * 		- store auth string to user record * 	- take auth=... string * 		- verify it * 		- auth the user record **/session_start();$logged_in = ( isset( $_SESSION[ 'LOGGED_IN' ] ) ) ? 'true' : 'false';echo "<div>LOGGED_IN: " . $logged_in . "</div>\n";// show the logIn formshowInOutForm( 0 );// show the logOut formshowInOutForm( 1 );// test logIn submitif ( isset( $_POST[ 'logIn' ] ) ) {	if ( isset( $_POST[ 'uname' ] ) && isset( $_POST[ 'upass' ] ) ) {		// try log-in#		logIn( $_POST[ 'uname' ], $_POST[ 'upass' ] );		$_SESSION[ 'LOGGED_IN' ] = 1;	}}// test logOut submitif ( isset( $_POST[ 'logOut' ] ) ) {	// unset session logged-in state	unset( $_SESSION[ 'LOGGED_IN' ] );}/******************************************************************************/function showInOutForm( $bit ){	$submit = 'Log-out';	$button = 'logOut';?><div id="rollCall">	<form action="" method="POST"><?php	if ( !$bit ) {?>		<div><label for="uname">uname</label>			<input type="text" name="uname" id="uname" value="" /></div>		<div><label for="upass">upass</label>			<input type="password" name="upass" id="upass" value="" /></div><?php		$submit = 'Log-in';		$button = 'logIn';	}	// !$bit?>		<div><input type="submit" name="<?php echo $button; ?>"			id="<?php echo $button; ?>" value="<?php echo $submit; ?>" /></div>	</form></div><?php} // showInOutForm(){}?>