How can undefined function errors be resolved when using PHP code to create database tables?

When encountering undefined function errors when using PHP code to create database tables, it is likely due to missing or incorrect database connection code. To resolve this issue, ensure that the database connection is properly established before executing any queries. 

<?php

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// SQL query to create a table
$sql = "CREATE TABLE users (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    firstname VARCHAR(30) NOT NULL,
    lastname VARCHAR(30) NOT NULL,
    email VARCHAR(50),
    reg_date TIMESTAMP
)";

// Execute query
if ($conn->query($sql) === TRUE) {
    echo "Table created successfully";
} else {
    echo "Error creating table: " . $conn->error;
}

// Close connection
$conn->close();

?>

Keywords

PHP database tables undefined function error resolution code creation

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