add str_contains function

Author: IonBazan

Php80.php

@@ -45,4 +45,9 @@ public static function preg_last_error_msg(): string
                 return 'Unknown error';
         }
     }
+
+    public static function str_contains(string $haystack, string $needle): bool
+    {
+        return '' === $needle || false !== strpos($haystack, $needle);
+    }
 }

README.md

@@ -8,6 +8,7 @@ This component provides features added to PHP 8.0 core:
 - `ValueError` class
 - `FILTER_VALIDATE_BOOL` constant
 - [`preg_last_error_msg`](https://php.net/preg_last_error_msg)
+- [`str_contains`](https://php.net/str_contains)
 
 More information can be found in the
 [main Polyfill README](https://github.com/symfony/polyfill/blob/master/README.md).

bootstrap.php

@@ -20,6 +20,10 @@ function fdiv(float $dividend, float $divisor): float { return p\Php80::fdiv($di
         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); }
+    }
+
     if (!defined('FILTER_VALIDATE_BOOL') && defined('FILTER_VALIDATE_BOOLEAN')) {
         define('FILTER_VALIDATE_BOOL', FILTER_VALIDATE_BOOLEAN);
     }