How can one identify and troubleshoot errors in SQL queries within PHP code?

To identify and troubleshoot errors in SQL queries within PHP code, one can use error handling techniques such as checking for errors returned by the database, utilizing try-catch blocks, and using functions like mysqli_error() to get detailed error messages. By carefully examining these error messages, one can pinpoint the issue in the SQL query and make necessary corrections. 

// Example PHP code snippet demonstrating error handling in SQL queries

// Connect to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Check for connection errors
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Perform SQL query
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

// Check for query errors
if (!$result) {
    die("Query failed: " . mysqli_error($connection));
}

// Process the query results
while ($row = mysqli_fetch_assoc($result)) {
    echo "User: " . $row['username'] . "<br>";
}

// Close the connection
mysqli_close($connection);

Keywords

SQL queries PHP code error identification troubleshooting debugging

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