How to install pecl extensions?

Which PCRE regular expression will match the string

Output of this statement echo substr('Think Different',6);

What is not a PHP type?

Given: $email = ‘[email protected]’; which code block will output example.com?

How to declare an interface?

var_dump((bool) -1); var_dump((bool) 1.5e5); var_dump((bool) 'false'); ?>

Which is the correct syntax of the function, Closure::from Callable, which is used to convert a callable into a closure?

$st = echo 'At index -4, the character is $st[-4].', PHP_EOL; $st[-3] = 'o'; echo 'Replacement at index -3 to o gives $st.', PHP_EOL; ?>

$bar = <<< 1;Anna;eats mangoes 2;Mark;eats apples EOF; function bar_parser($bar) { foreach (explode('\n', $bar) as $I) { $foo = explode(';', $I); $id = array_shift($foo); yield $id => $foo; } } foreach (bar_parser($bar) as $id => $foo) { echo '$id:\n'; echo' $foo[0]\n'; echo' $foo[1]\n'; } ?>