Which PHP function checks a month, day, and year number to determine if they form a valid Gregorian date?

Correct way to assign a class constant?

class A{} class_alias( 'A', 'B' ); var_dump(new B); outputs ...

PHP variable $hello is set to 'HELLO WORLD'. Which statement would return 'Hello World' instead?

Correct usage of the chmod() function?

Functions can be used to execute a shell command?

Which is false about foreach loop in PHP?

When user clicks on Logout link, the user is redirected to logout.php file and the file has following code? What is wrong with the following code?

What will be the output ? #FFF#333Verdana, Geneva, sans-serif'; $xml = simplexml_load_string($xmlFile); foreach($xml->css as $css) { echo (string) $css->element['id'].'{'; foreach($xml->css->element->csstag as $tag) { $temp = $tag->title.': '.$tag->value.';'; echo $temp; } echo '}'; } ?>

What is the output? '; $array1 = array( '1'=>'a', '2'=>'b', '3'=>'c' ); $array = array_flip($array1); print_r($array); echo ''; ?>

Which options may be a reason for the error - 'Call to undefined function curl_init()'?