ランダムに 8 つのページのいずれかにリダイレクトする小さなスクリプトを作成しました。ページを選択する前に、選択肢を絞り込むようにデータベースに問い合わせます。(すべてのページが同じシードで選択されるように) . 残念ながら、do-while ループにはまってしまいました。コードは次のとおりです。
<?php
$surveys = array(
1 => "711275",
2 => "488985",
3 => "515385",
4 => "467411",
5 => "755429",
6 => "335888",
7 => "673921",
8 => "532261");
$surveysCount = array(
1 => 0,
2 => 0,
3 => 0,
4 => 0,
5 => 0,
6 => 0,
7 => 0,
8 => 0);
$path = 'http://www.unet.univie.ac.at/~a0106191/index.php/';
$pathPostfix = '/lang-de';
$user = 'xxxx';
$pass = 'xxxx';
$host = 'xxxx';
// establish database connection
$conn = mysql_connect($host, $user, $pass) or die('Cannot connect to Database - Please try later!');
mysql_select_db('a0106191', $conn) or die('Cannot connect to Database - Please try later!');
foreach ($surveys as $nr=>$survey) {
$stmt = 'SELECT submitdate FROM lime_survey_'.$survey.' WHERE submitdate IS NOT NULL';
//echo $stmt.'<br/>';
if($res = mysql_query($stmt)) {
if (mysql_num_rows($res) > 0) {
$surveysCount[$nr] = mysql_num_rows($res);
}
}
//echo $surveysCount[$nr].'<br/>';
}
$selection = array();
$counter = 0;
do {
$offset = 0;
for ($i = 1; $i < 9; $i++) {
if ($surveysCount[$i] === $offset){
$sel = $surveys[$i];
$selection[] = $sel;
$counter++;
}
}
$offset++;
//echo $selection;
} while ($counter < 1);
// clean up connections
mysql_close($conn);
$whichSurveyNr = mt_rand(1, $counter);
$which = $selection[$whichSurveyNr-1];
$which = $path.$which.$pathPostfix;
echo "wSrNr:";
echo $whichSurveyNr;
echo "selection: ";
echo count($selection);
echo " which: ";
echo $which;
foreach($selection as $k => $v)
echo " sel: k: ".$k." v: ".$v;*/
header("Location: $which");
?>