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<?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 for git.master, git.master_jit, rfc.property-hooks
select * from table WHERE class = 'EFG' AND course in (?, ?, ?, ?)

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