Which PHP string function is used to convert the first letter of a string to uppercase?

How do you create a non-public method, which can be used in a child-class?

What's the output?

Variable assignment which is performed 'by value' in PHP.

What does the following output? echo (5 % 3);

What will range('a', 'z') return?

PHP Errors, There are following type levels of error severity to start with?

Which is not supported in PHP?

Which syntax is not correct to embed PHP?

Output using PHP 5.6.0 or higher? const ONE = 1; class foo { const TWO = ONE * 2; const THREE = ONE + self::TWO; const SENTENCE = 'The value of THREE is '.self::THREE; } echo foo::SENTENCE . '\n';

Which return true keeping in view the following code? function validateDate($date, $format = 'Y-m-d H:i:s') { $d = DateTime::createFromFormat($format, $date); return $d && $d->format($format) == $date; }