Why Do My Second MySQL Queries Fail, and How Can `mysqli_multi_query()` Help?

Two mysqli Queries Simultaneously?

When attempting to execute multiple MySQL queries, why would the second query fail?

The mysqli_multi_query() Solution

To address this issue, consider utilizing the mysqli_multi_query() function. This function allows you to execute multiple queries within a single mysqli call.

Example Implementation

Start by formulating a string containing your queries, separating each with a semicolon (;).

Subsequently, execute the multi-query using mysqli_multi_query():

Handling Execution Results

The execution results are captured in the $result variable. If the first query fails, $result will be false.

Next Steps and Precautions

Additionally, note that mysqli_store_result() will return false for queries without a result set (such as INSERT queries). Therefore, ensure to use mysqli_error() to verify a successful INSERT by checking for an empty result.

Reference the provided documentation for more information on mysqli_multi_query(), mysqli_more_results(), mysqli_next_result(), and mysqli_store_result() functions.

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