How can PHP developers ensure the proper functioning of MySQL functions like mysql_fetch_array() to avoid undefined function errors?

To ensure the proper functioning of MySQL functions like mysql_fetch_array() and avoid undefined function errors, PHP developers should make sure that the MySQL extension is enabled in their PHP configuration. They can do this by checking the php.ini file and ensuring that the extension=php_mysql.dll line is uncommented. Additionally, developers should consider migrating to MySQLi or PDO extensions, as the mysql extension is deprecated in newer PHP versions. 

// Check if the MySQL extension is enabled
if (!function_exists('mysql_connect')) {
    die('MySQL extension is not enabled');
}

// Your code using mysql_fetch_array() can go here

Keywords

PHP MySQL mysql_fetch_array() function errors proper functioning

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