$message vs. $$message . what is the difference

What is the opening tag for PHP

Keyword to create object of a class in PHP?

Value returned by the preg_match function 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));

What is the end tag in PHP

Best way to convert one date format into another; portable for all PHP versions?

Which statement is incorrect, with regards to inheritance in PHP?

Is the ||= operator present in PHP?

With what encoding does chr() work?

Which will return the extension of a file name?