To ensure that a given object has a particular set of methods, you must provide a method list in the form of an ________ and then attach it as part of your class using the ________ keyword.

Output of the following code? $arr = 'a'; $arr[0]='b'; echo $arr; echo $arr[0];

Which function compare the substrings of the parameters?

Outputs? function add($a) { return $a++; } echo add(5);

How do you get header information from a URL?

Difference between idate and date function?

Which is the correct output of the following PHP 7.1 program? function swap(&$x, &$y): void { if ($x === $y) { return; } $exp = $x; $x = $y; $y = $exp; } $var1 = 12; $var2 = 20; var_dump(swap($var1, $var2), $var1, $var2);?>

Which is correct about the following PHP 7.1 code? $example = 25; $b = &$example; $b = &(12 * 9); function t() { return 15; } $b = &t(); ?>

Which is an invalid constant in PHP 7.1?

Output of the following code? class Bar { public function checking() { return function() { var_dump($this); }; } } $object = new Bar; $function = $object->checking(); $function(); ?>

interface ExampleInterface { } class ExampleClass implements Exampleinterface { } $x = new ExampleClass; $y = new ExampleClass; $z = $p = 'NotExampleClass'; var_dump($x instanceof $y); var_dump($x instanceof $z); var_dump($x instanceof $p); ?>