utilization of operator ??

Author: dg

src/Utils/Callback.php

@@ -177,7 +177,7 @@ public static function unwrap(\Closure $closure)
 		$r = new \ReflectionFunction($closure);
 		if (substr($r->getName(), -1) === '}') {
 			$vars = $r->getStaticVariables();
-			return isset($vars['_callable_']) ? $vars['_callable_'] : $closure;
+			return $vars['_callable_'] ?? $closure;
 
 		} elseif ($obj = $r->getClosureThis()) {
 			return [$obj, $r->getName()];

src/Utils/Html.php

@@ -70,7 +70,7 @@ public static function el($name = NULL, $attrs = NULL)
 
 		if (isset($parts[1])) {
 			foreach (Strings::matchAll($parts[1] . ' ', '#([a-z0-9:-]+)(?:=(["\'])?(.*?)(?(2)\\2|\s))?#i') as $m) {
-				$el->attrs[$m[1]] = isset($m[3]) ? $m[3] : TRUE;
+				$el->attrs[$m[1]] = $m[3] ?? TRUE;
 			}
 		}
 
@@ -175,7 +175,7 @@ public function setAttribute($name, $value)
 	 */
 	public function getAttribute($name)
 	{
-		return isset($this->attrs[$name]) ? $this->attrs[$name] : NULL;
+		return $this->attrs[$name] ?? NULL;
 	}
 
 
@@ -249,7 +249,7 @@ public function __call($m, $args)
 			$m = substr($m, 3);
 			$m[0] = $m[0] | "\x20";
 			if ($p === 'get') {
-				return isset($this->attrs[$m]) ? $this->attrs[$m] : NULL;
+				return $this->attrs[$m] ?? NULL;
 
 			} elseif ($p === 'add') {
 				$args[] = TRUE;

src/Utils/Strings.php

@@ -592,7 +592,7 @@ public static function pcre($func, $args)
 		if (($code = preg_last_error()) // run-time error, but preg_last_error & return code are liars
 			&& ($res === NULL || !in_array($func, ['preg_filter', 'preg_replace_callback', 'preg_replace']))
 		) {
-			throw new RegexpException((isset($messages[$code]) ? $messages[$code] : 'Unknown error')
+			throw new RegexpException(($messages[$code] ?? 'Unknown error')
 				. ' (pattern: ' . implode(' or ', (array) $args[0]) . ')', $code);
 		}
 		return $res;

src/Utils/Validators.php

@@ -134,7 +134,7 @@ public static function is($value, $expected)
 					continue;
 				}
 			} elseif ($type === 'pattern') {
-				if (preg_match('|^' . (isset($item[1]) ? $item[1] : '') . '\z|', $value)) {
+				if (preg_match('|^' . ($item[1] ?? '') . '\z|', $value)) {
 					return TRUE;
 				}
 				continue;