PHP polyfills

Polyfills are PHP implementations of functions natively supported by KPHP.
Without polyfills, your code can be compiled, but can't be run by plain PHP.

‘Polyfills', what is it?

Consider the following code:

$first = array_first_value(['o' => 1, 't' => 2]);  // 1

Is can be compiled and run with KPHP, but executing it with PHP leads to

This function is KPHP built-in. KPHP doesn't support internal arrays pointers and functions like end() and current() — to have less overhead. Instead, KPHP has analogs, array_first_value() for example.
In PHP, it can be implemented as:

// for PHP only!
function array_first_value(array $a) {
  reset($a);
  return current($a);
}

This is a PHP polyfill for KPHP array_first_value().

Existing polyfills ready for your project

This repository contains everything you need (it's a Composer package):

kphp-polyfills

Just install this package — and use KPHP built-in functions in PHP code.