What is 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?

____ will walk through the entire array regardless of pointer position.

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); ?>

Output of the following code? $example = array(2, 4, 6, 8, 10); foreach ($example as $x => $value){ unset($example[$x]); } print_r($example); $example[] = 12; print_r($example); $example = array_values($example); $example[] = 14; print_r($example); ?>