Which of the following environment variables is used to fetch the IP address of the user in a PHP application?

With regards to the 'static' keyword in PHP, which statements is false?

Which code snippet has the most appropriate headers to force the browser to download a CSV file?

Which will return the extension of a file name?

With what encoding does chr() work?

Is the ||= operator present in PHP?

Use of Unlink()

What function in PHP to display?

What is the end tag in PHP

$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4); $array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8); var_dump(array_diff_key($array1, $array2));

Value returned by the preg_match function in php?