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POHow to insert an array into a single MySQL Prepared statement w/ PHP and PDO
 

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  1. POHow to insert an array into a single MySQL Prepared statement w/ PHP and PDO
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    <p>During an online enrollment, a customer may select a number of programs which they choose to enroll for. These programs are three digit integers and are stored in an array.</p> <p>For example:</p> <p>I want to enroll in programid 155, 165, 175, and 185.</p> <p>My array is set up as simple as:</p> <pre><code>$data = array(); $data[] = 155; $data[] = 165; $data[] = 175; $data[] = 185; </code></pre> <p>When it comes time to insert this information into the associated table, I also include additional elements from the other part of the enrollment:</p> <p>For example, if I were doing a SINGLE program insert statement, it would look as follows:</p> <pre><code>$stmt = $db-&gt;prepare("INSERT INTO table SET memberID=?, programID=?, date_added=NOW()"); $stmt-&gt;execute(array($memberid, 155)); </code></pre> <p>I would normally create a simple loop for the array above which would call multiple instances of the sql statement and execute such as:</p> <pre><code>for($j = 0; $j &lt; (count($data)-1); $j++) { $stmt = $db-&gt;prepare("INSERT INTO table SET memberID=?, programID=?, date_added=NOW()"); $stmt-&gt;execute(array($memberid, $data[$j])); } </code></pre> <p>I do realize the code above is invalid ( $data[$j] ) but looking for the right way to do the call.</p> <p>I have also been told before that building a single dynamic sql statement is overall better than multiple calls like above. My first pass would be something like:</p> <pre><code>$sql = array(); foreach( $data as $row ) { $sql[] = '("'.$memberid.'", "'.$row[$j].'", NOW()")'; } mysql_real_query('INSERT INTO table (memberid, programid) VALUES '.implode(',', $sql)); </code></pre> <p>but with PDO I am not quite sure how this works, especially with placeholders (?). </p> <p>Any suggestions?</p>
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    1. CODon't run the prepare more than once. One it's prepared, you can execute it multiple times with different values.
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