fixes #2066 keep Smarty compatible with PHP 7.0

include/smarty/libs/plugins/modifier.explode.php

@@ -18,7 +18,7 @@
  *
  * @return array
  */
-function smarty_modifier_explode($separator, $string, ?int $limit = null)
+function smarty_modifier_explode($separator, $string, $limit = null)
 {
     // provide $string default to prevent deprecation errors in PHP >=8.1
     return explode($separator, $string ?? '', $limit ?? PHP_INT_MAX);

include/smarty/libs/plugins/modifier.number_format.php

@@ -19,7 +19,7 @@
  *
  * @return string
  */
-function smarty_modifier_number_format(?float $num, int $decimals = 0, ?string $decimal_separator = ".", ?string $thousands_separator = ",")
+function smarty_modifier_number_format($num, int $decimals = 0, $decimal_separator = ".", $thousands_separator = ",")
 {
     // provide $num default to prevent deprecation errors in PHP >=8.1
     return number_format($num ?? 0.0, $decimals, $decimal_separator, $thousands_separator);

include/smarty/libs/sysplugins/smartycompilerexception.php

@@ -19,8 +19,8 @@ class SmartyCompilerException extends SmartyException
     public function __construct(
         string $message = "",
         int $code = 0,
-        ?string $filename = null,
-        ?int $line = null,
+        $filename = null,
+        $line = null,
         Throwable $previous = null
     ) {
         parent::__construct($message, $code, $previous);