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    <p>You're missing semi-colons in your mutli-query statement.</p> <p>You can add them in front of the queries you are concatenating (<code>.=</code>) for consistency, since the if statement may or may not add a query into the mix.</p> <pre><code>//insert user input into db $query = "INSERT INTO test_details (test_title, user_id, likes) VALUES ('$title', '$user_id', '0')"; $query .= ";INSERT INTO test_descriptions (test_id, description) VALUES (LAST_INSERT_ID(), '$description')"; if(isset($grade) &amp;&amp; isset($difficulty) &amp;&amp; isset($subject)) { $query .= ";INSERT INTO test_descriptions (test_id, grade, subject, difficulty) VALUES (LAST_INSERT_ID(), '$grade', '$subject', '$difficulty')"; } if(mysqli_multi_query($con, $query)) { echo 'Go &lt;a href="../create"&gt;back&lt;/a&gt; to start creating questions.'; } else { echo "An error occurred! Try again later."; echo mysqli_error($con); } </code></pre> <p>Or as andrewsi mentioned, the implode method:</p> <pre><code>//insert user input into db $query[] = "INSERT INTO test_details (test_title, user_id, likes) VALUES ('$title', '$user_id', '0')"; $query[] = "INSERT INTO test_descriptions (test_id, description) VALUES (LAST_INSERT_ID(), '$description')"; if(isset($grade) &amp;&amp; isset($difficulty) &amp;&amp; isset($subject)) { $query[] = "INSERT INTO test_descriptions (test_id, grade, subject, difficulty) VALUES (LAST_INSERT_ID(), '$grade', '$subject', '$difficulty')"; } if(mysqli_multi_query($con, implode( ';', $query ))) { echo 'Go &lt;a href="../create"&gt;back&lt;/a&gt; to start creating questions.'; } else { echo "An error occurred! Try again later."; echo mysqli_error($con); } </code></pre>
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    1. USJason
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    1. COYou can also add the separate statements to an array, and then `implode` it, using a semi-colon as glue.
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    2. COThank you for two solutions, I am used to using mysqli_query all the time. Will accept as correct answer.
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      1. USTom
    3. COAlso, why add semi-colons in front of the queries? The code will work with semi-colons at the end.
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