What role does the mysqli_error function play in debugging PHP MySQLi queries?

The mysqli_error function in PHP MySQLi allows developers to retrieve detailed error messages when executing queries, which can be helpful in debugging issues with database operations. By checking the output of mysqli_error after executing a query, developers can quickly identify and address any syntax errors, connection problems, or other issues that may be causing the query to fail. 

<?php
// Create a connection to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

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

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

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

// Close the connection
mysqli_close($connection);
?>

Keywords

PHP MySQLi mysqli_error debugging queries

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