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@ 2018-11-20T20:09:31Z

<?php
$courses = array('Eng', 'Deu', 'Bio', 'Chemi');
$placeholders = rtrim(str_repeat('?, ', count($courses)), ', ');
$query = "select * from table WHERE class = 'EFG' AND course in ({$placeholders})";
echo $query;
/*
$stmt = $pdo->prepare($query);
$stmt->execute($courses);
*/

Output
Performance
VLD
References
Branches

rtrim: documentation ( source)
str_repeat: documentation ( source)

preferences:dark modelive previewkey bindings

38.17 ms | 405 KiB | 5 Q