How to declare an interface?

What is the new syntax of array ?

Which functions allows you to store session data in a database?

What is wrong with the following code? setValue(10); $a_copy->setValue(20); ?>

Add five days to a PHP5 date-object like this: $date_object = date_create('1/18/2015');

Output of the following code: sayHello($c);

Which code statement should replace ??? to obtain 12345 as output? function recursive($var){ echo $var; if($var < 5){ ??? } } $a = 1; recursive($a); ?>

var $example = var $array = array('My name is A.', 'My name is B.', 'My name is C.'); var $r = 'My name is r.'; } $f = new f(); $example = 'example'; $b = array('f', 'example', 'b', 'c'); echo $f->$example. '\n'; echo $f->{$b[1]} . '\n'; $start = 'exa'; $end = 'mple'; echo $f->{$start. $end}. '\n'; $array = 'array'; echo $f->{$array[1]}. '\n'; ?>

Which option can be the key of an array?

class Example { public function abcFunction() { return Closure::fromCallable([$this, } private function privateFunction($param) { var_dump($param); } } $expFunc = (new Example)->abcFunction(); $expFunc('My New Example');?>

$E_array = array( 'test' => 'code', 64 =>46, 'multi' => array( 'dimensional' => array( 'array' => 'test' ) ) ); var_dump($E_array['test']); var_dump($E_array [64]); var_dump($E_array['multi']['dimensional']['array']); ?>