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PHP script to check if a turk worker has done an experiment
// sample usage in javascript:
type: 'post',
url: '../exclude_subjects.php',
data: {"mturk_id": turk.workerId, "tables": JSON.stringify(['exp_1', 'exp_2']), "col_id": "mturk_id"},
success: function(data)
// do stuff here to allow subject to continue
} else {
// subject already in database. do stuff to prevent them from doing experiment, like...
$("#instructions").html('<h3>Sorry, you have already participated in this study or a related study and are not eligible to complete this HIT.</h3>');
// edit this line for database check
function check_mturk_id($tables, $id) {
for($i=0; $i < count($tables); $i++){
$result = mysql_query('SELECT DISTINCT '.mysql_real_escape_string($col_id).' FROM '.mysql_real_escape_string($tables[$i]));
while($row = mysql_fetch_array($result))
if($row["mturk_id"] == $id)
return false;
return true;
// get id from POST call
$id = $_POST['mturk_id'];
$col_id = $_POST['col_id'];
$tables = $_POST['tables'];
$tables = json_decode($tables,true);
// check id
$r = check_mturk_id($tables, $id, $col_id);
// echo out TRUE or FALSE
echo $r;

This should sanitize the variables that come in on POST to prevent injections... use at your own risk until that's fixed.


need a file database_connect.php with database connection info.

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