PHP Interview Questions and Answers for freshers and experienced – 05

by using spl_autoload_register(‘autoloader::funtion’);

Like below

class autoloader

{

public static function moduleautoloader($class)

{

$path = $_SERVER[‘DOCUMENT_ROOT’] . “/modules/{$class}.php”;

if (is_readable($path)) require $path;

}

public static function daoautoloader($class)

{

$path = $_SERVER[‘DOCUMENT_ROOT’] . “/dataobjects/{$class}.php”;

if (is_readable($path)) require $path;

}

public static function includesautoloader($class)

{

$path = $_SERVER[‘DOCUMENT_ROOT’] . “/includes/{$class}.php”;

if (is_readable($path)) require $path;

}

}

spl_autoload_register(‘autoloader::includesautoloader’);

spl_autoload_register(‘autoloader::daoautoloader’);

spl_autoload_register(‘autoloader::moduleautoloader’);

While PDO has its advantages, such as a clean, simple, portable API but its maindisadvantage is that it doesn’t allow you to use all of the advanced features that are available in the latest versions of MySQL server. For example, PDO does not allow you to use MySQL’s support for Multiple Statements.

Just need to use below code for connect mysql using PDO
try {
$dbh = new PDO(“mysql:host=$hostname;dbname=databasename”, $username, $password);
$sql = “SELECT * FROM employee”;
foreach ($dbh->query($sql) as $row)
{
print $row[’employee_name’] .’ – ‘. $row[’employee_age’] ;
}
}
catch(PDOException $e)
{
echo $e->getMessage();
}

The mysqli extension has a number of benefits, the key enhancements over the mysql extension being:
=>Object-oriented interface
=>Support for Prepared Statements
=>Support for Multiple Statements
=>Support for Transactions
=>Enhanced debugging capabilities
=>Embedded server support