Online PHP editor | output for VNYbk

<?php echo substr_replace('stack', 'i', 2, 1) . PHP_EOL; // stick echo substr_replace('stack', 'u', -3, 1) . PHP_EOL; // stuck echo substr_replace('stack', 'o', 1, 2) . PHP_EOL; // sock echo substr_replace('stack', 'ge', -2, 2) . PHP_EOL; // stage echo substr_replace('stack', 'bri', 0, 3) . PHP_EOL; // brick echo substr_replace('stack', 'hre', 1, -1) . PHP_EOL; // shrek echo substr_replace('stack', 'hre', -4, -1) . PHP_EOL; // shrek echo substr_replace('stack', 'y', 3, 0) . PHP_EOL; // stayck ...consume no bytes echo substr_replace('stack', 'y', 3) . PHP_EOL; // stay ...consume remaining bytes echo substr_replace('voilà', 'ci', -2) . PHP_EOL; // voilci ...à has two bytes echo substr_replace('voilà', 'ci', -3) . PHP_EOL; // voici ...à has two bytes echo substr_replace('sûreté', '', 4) . PHP_EOL; // sûr ...û has two bytes