What operator is used to test if two values are identical in every way

If regular expressions must be used, in general which type of regular expression functions available to PHP is preferred for performance reasons?

One can include ('abc.PHP') two times in a PHP page 'makeit.PHP'.

Which function would you use to append one or more elements to the end of the array?

A fatal error would be caught by

(8 < 1 || 4 >= 4 ) will return

While creating or modifying an array in PHP 7.1, what will happen if an empty index operator is applied on a string?

Find the output of the following PHP code. $string = echo 'The output for '$string' is '$string[-1]'.\n'; ?>

Under which scenario, a TypeError may be thrown? i) When the argument type, which is being passed to a function, does not match its corresponding declared parameter type. ii) When the returned value from a function does not match the declared function return type. iii) When an invalid number of arguments are passed to a built-in PHP function.

Which is the correct syntax for a function with iterable generator return type?