Programming Economic Experiments with Php/mysql

with contributions by:
Boris van Leeuwen
Roel van Veldhuizen
Jeroen van de Ven
Lucas Molleman
Joep Sonnemans
Jona Linde

Printing receipts

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Boris van Leeuwen has programmed some code to print receipts for all participants, with earnings rounded on 10 cents. The code is in three pages: kwitanties.php asks let you check whether some variables in the commonparameter table are correct, blancobon.php prints empty receipts for students that are sent away or for emergency situations, and printbon.php prints receipts of the kind we commonly use at CREED, with the data, number experiment and session, and the organizers of the experiment. Four receipts are printed per page: for this you need the boris.css in the css directory and especially this style code:
@media print
p.vier {page-break-after:always;}

The code uses the following information from the commonparameters table (read by the included file):

and from the ppnummers table it uses for each participant:

So if you use different names for these tables and variables, you have to adapt these names.

$connection = @mysql_connect(HOST,ADMIN, WWOORD) or die(mysql_error());
$db = @mysql_select_db(DBNAME,$connection) or die(mysql_error());
$sql3="SELECT * FROM $table_name ORDER BY `tafelnummer` ASC";
$result=@mysql_query($sql3,$connection) or die("Couldn't execute query ".$sql3);
$today = date("j-n-Y");  
$bonnen="<table border=0>";
while ($row=mysql_fetch_array($result)) {
	$euros=number_format(round($totverdeuros,1), 2, ',', '');
	<table class=rond align=center border=0 width=800><col width=5%><col width=15%><col width=5%><col width=55%><col width=5%><col width=10%><col width=5%>
	<tr><td colspan=7><br></td></tr>
	<tr><td></td><td class=echtklein>Organisatie:</td><td class=echtklein colspan=2>".$expters."</td><td class=echtklein>Datum:</td><td class=echtklein>".$today."</td><td></td></tr>
	<tr><td></td><td class=echtklein>CREED-experiment:</td><td class=echtklein colspan=2>".$expnummer."-".$session."</td><td class=echtklein>Tafel:</td><td class=echtklein>".$tafelnummer."</td><td></td></tr>
	<td colspan=7 align=center><H1>KWITANTIE</H1></td></tr>
	<tr><td></td><td colspan=5 align=left>Ondergetekende verklaart hierbij <b>".$euros."</b> euro te hebben ontvangen voor zijn/haar deelname aan het CREED-Experiment.
	<p ".$vier."></p>
	$bonnen .= $bon;			
$bonnen .= "</table></table>";
<link rel="stylesheet" type="text/css" href="boris.css" />
<link rel="stylesheet" type="text/css" href="buttons.css" />
<?php echo $bonnen; ?>