What purpose do namespaces fulfill?

The following form is loaded in a browser and submitted, with the checkbox activated:

< form method="post" >

< input type="checkbox" name="accept" / >

< /form >

In the server-side PHP code to deal with the form data, what is the value of $_POST['accept'] ?

What is the output of the following code?

echo 0x33, ' monkeys sit on ', 011, ' trees.';

How many elements does the $matches array contain after the following function call is performed?

preg_match('/^(\d{1,2}([a-z]+))(?:\s*)\S+ (?=201[0-9] )/', '21st March 2014', $matches);

When a class is defined as final it:

What function can be used to retrieve an array of current options for a stream context?

Which of the following superglobals does not necessarily contain data from the client?

What is the output of the following code?

$a = array('a', 'b'= > 'c');

echo property_exists((object) $a, 'a')?'true':'false';

echo '-';

echo property_exists((object) $a, 'b')?'true':'false';

Which technique should be used to speed up joins without changing their results?

In the following code, which classes can be instantiated?

abstract class Graphics {

abstract function draw($im, $col);

}

abstract class Point1 extends Graphics {

public $x, $y;

function __construct($x, $y) {

$this- > x = $x;

$this- > y = $y;

}

function draw($im, $col) {

ImageSetPixel($im, $this- > x, $this- > y, $col);

}

}

class Point2 extends Point1 { }

abstract class Point3 extends Point2 { }