", print_r($_POST, true), "
";
// show errors
ini_set('display_errors',1);
/* Read in CGI Data
Let's begin by reading in all the data that are relevant to our project.
Note: The simplist way to do this is to read in, quite literally,
EVERYTHING that we will need at ANY point during the project--whether it
exists at this pass or not.
*/
$v01 = $_POST['v01'];
$pass = $_POST['pass'];
$this_condition = $_POST['this_condition'];
// Where to start?
// If pass is empty, assume it is the person's first time here
// and set pass to 1 to start.
if(empty($pass)){
$pass = 1;
}
/*
We're going to assign people to one of four conditions in a 2x2 bewteen-persons experiement.
In this example, I haven't literally varied two factors. But the basic process is the same.
In a 2x2 between subjects experiment, we would have 4 conditions and the probability of being
assigned to any one of those 4 is 1/4.
*/
$condition = array("condition 1","condition 2","condition 3","condition 4");
// Pass = 1
if($pass == 1){
// print_r($condition);
// Let's shuffle the condition array
shuffle($condition);
// print_r($condition);
// And then select the 0th element of it as the condition for this participant
$this_condition = $condition[0];
print "\$this_condition = $this_condition
";
/*
In this example experiment, we will display one of four unique images, depending
on what condition the user has been assigned.
Specifically, we will show 1 of 4 lolcats images and ask for a rating of the image.
To do this, we simply create a variable, $this_stimulus, that will represent the
name of the image file that we wish to display. We set this variable via if-conditions.
*/
print "";
} // End pass == 1
// If we have the rating, we're done. Say thank you.
// Let's also save the data
if($pass >= 2 ){
print "\$this_condition = $this_condition
";
$date = getdate();
$date1 = $date[mon] . "/" . $date[mday] . "/" . $date[year];
$date2 = $date[hours] . ":" . $date[minutes] . ":" . $date[seconds];
// Let's create a variable that contains--as one long text string--all the information
// we wish to save for the user.
$stringData = "\n" . $date1 . "," . $date2 . "," . $this_condition . "," . $v01 . "," . "endline";
// Finally open the file, place the data within, then close the file.
$myFile = "PHPtutorial12Data.txt"; // set the datafile name
$fh = fopen($myFile, 'a') or die("can't open file"); // open the file a = append
fwrite($fh, $stringData); // place the data in the file
fclose($fh); // close the file
print "Thank you for your rating!";
}
?>