Allow null in str_*() functions

Author: derrabus

bootstrap.php

@@ -26,13 +26,13 @@ function fdiv(float $num1, float $num2): float { return p\Php80::fdiv($num1, $nu
     function preg_last_error_msg(): string { return p\Php80::preg_last_error_msg(); }
 }
 if (!function_exists('str_contains')) {
-    function str_contains(string $haystack, string $needle): bool { return p\Php80::str_contains($haystack, $needle); }
+    function str_contains(?string $haystack, ?string $needle): bool { return p\Php80::str_contains($haystack ?? '', $needle ?? ''); }
 }
 if (!function_exists('str_starts_with')) {
-    function str_starts_with(string $haystack, string $needle): bool { return p\Php80::str_starts_with($haystack, $needle); }
+    function str_starts_with(?string $haystack, ?string $needle): bool { return p\Php80::str_starts_with($haystack ?? '', $needle ?? ''); }
 }
 if (!function_exists('str_ends_with')) {
-    function str_ends_with(string $haystack, string $needle): bool { return p\Php80::str_ends_with($haystack, $needle); }
+    function str_ends_with(?string $haystack, ?string $needle): bool { return p\Php80::str_ends_with($haystack ?? '', $needle ?? ''); }
 }
 if (!function_exists('get_debug_type')) {
     function get_debug_type($value): string { return p\Php80::get_debug_type($value); }