<?php

if (!function_exists('str_starts_with')) {
    function str_starts_with($haystack, $needle)
    {
        return (string)$needle !== '' && strncmp($haystack, $needle, strlen($needle)) === 0;
    }
}

if (!function_exists('str_ends_with')) {
    function str_ends_with($haystack, $needle)
    {
        return $needle !== '' && substr($haystack, -strlen($needle)) === (string)$needle;
    }
}

if (!function_exists('str_contains')) {
    function str_contains($haystack, $needle)
    {
        return $needle !== '' && mb_strpos($haystack, $needle) !== false;
    }
}

if (!function_exists('array_is_list')) {
    function array_is_list(array $arr)
    {
        if ($arr === []) {
            return true;
        }
        return array_keys($arr) === range(0, count($arr) - 1);
    }
}
