How can error handling techniques such as mysql_error() be used to troubleshoot issues with MySQL queries in PHP?

If there are issues with MySQL queries in PHP, error handling techniques such as mysql_error() can be used to troubleshoot and identify the specific problem. By incorporating mysql_error() into the code, any errors that occur during the execution of the query will be displayed, providing valuable information for debugging and resolving the issue. 

// Connect to MySQL database
$conn = mysqli_connect("localhost", "username", "password", "database");

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

// Execute MySQL query
$result = mysqli_query($conn, "SELECT * FROM table");

// Check for errors
if (!$result) {
    die("Error: " . mysqli_error($conn));
}

// Process query results
while ($row = mysqli_fetch_assoc($result)) {
    // Do something with the data
}

// Close connection
mysqli_close($conn);

Keywords

error handling mysql_error() MySQL queries PHP troubleshooting

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