Why Can't I Run Two `mysqli_query()` Calls Simultaneously in MySQL?

Why Can't Two mysqli Queries Be Run Simultaneously?

In MySQL, executing multiple queries in a single call requires the use of mysqli_multi_query(). Attempting to execute two queries using mysqli_query() will result in the second query failing.

Solution: mysqli_multi_query()

To resolve this issue, the correct method to use is mysqli_multi_query(). It takes a string of queries separated by semicolons as its input.

Example:

$mysqli = new mysqli($host, $user, $password, $database);

// Queries to be executed
$query = "INSERT INTO images (project_id, user_id, image_name, ...) VALUES (...);";
$query .= "INSERT INTO images_history (project_id, user_id, image_name, ...) VALUES (...);";

// Execute queries using mysqli_multi_query()
$result = mysqli_multi_query($mysqli, $query);

// Handle results
if ($result) {
    // Process results using mysqli_store_result() and mysqli_next_result()
} else {
    // Handle error (if any)
}

Note:

• mysqli_query() will not execute multiple queries for security reasons (SQL injections prevention).
• mysqli_store_result() must be used after mysqli_multi_query() to retrieve result sets.
• mysqli_error() should be checked to ensure that INSERT queries were successful (even though they have no result sets).

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