Removed unnecessary docblocks and imports from #23

Since we now use native parameter type declarations, we no longer need
to have `@param string $param` declarations.

Also, `is_string()` and `gettype()` are no longer in use (were used when
throwing an exception based on invalid input).

Note that `@return string` is preserved: we cannot introduce native return
type declarations, as that would lead to downstream crashes in inheritance
scenarios, when the consumer didn't declare `: string` return types themselves
too.

src/Escaper.php

@@ -7,12 +7,10 @@
 use function bin2hex;
 use function ctype_digit;
 use function function_exists;
-use function gettype;
 use function hexdec;
 use function htmlspecialchars;
 use function iconv;
 use function in_array;
-use function is_string;
 use function mb_convert_encoding;
 use function ord;
 use function preg_match;
@@ -132,7 +130,6 @@ class Escaper
      * Constructor: Single parameter allows setting of global encoding for use by
      * the current object.
      *
-     * @param string|null $encoding
      * @throws Exception\InvalidArgumentException
      */
     public function __construct(?string $encoding = null)
@@ -178,7 +175,6 @@ public function getEncoding()
      * Escape a string for the HTML Body context where there are very few characters
      * of special meaning. Internally this will use htmlspecialchars().
      *
-     * @param string $string
      * @return string
      */
     public function escapeHtml(string $string)
@@ -191,7 +187,6 @@ public function escapeHtml(string $string)
      * to escape that are not covered by htmlspecialchars() to cover cases where an attribute
      * might be unquoted or quoted illegally (e.g. backticks are valid quotes for IE).
      *
-     * @param string $string
      * @return string
      */
     public function escapeHtmlAttr(string $string)
@@ -214,7 +209,6 @@ public function escapeHtmlAttr(string $string)
      * Backslash escaping is not used as it still leaves the escaped character as-is and so
      * is not useful in a HTML context.
      *
-     * @param string $string
      * @return string
      */
     public function escapeJs(string $string)
@@ -233,7 +227,6 @@ public function escapeJs(string $string)
      * an entire URI - only a subcomponent being inserted. The function is a simple proxy
      * to rawurlencode() which now implements RFC 3986 since PHP 5.3 completely.
      *
-     * @param string $string
      * @return string
      */
     public function escapeUrl(string $string)
@@ -245,7 +238,6 @@ public function escapeUrl(string $string)
      * Escape a string for the CSS context. CSS escaping can be applied to any string being
      * inserted into CSS and escapes everything except alphanumerics.
      *
-     * @param string $string
      * @return string
      */
     public function escapeCss(string $string)