[Debug][ErrorHandler] fix operator precedence

Debug.php

@@ -49,7 +49,7 @@ class Debug
         if (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
             ini_set('display_errors', 0);
             ExceptionHandler::register();
-        } elseif ($displayErrors && (!filter_var(ini_get('log_errors'), \FILTER_VALIDATE_BOOLEAN) || ini_get('error_log'))) {
+        } elseif ($displayErrors && (!filter_var(\ini_get('log_errors'), \FILTER_VALIDATE_BOOLEAN) || \ini_get('error_log'))) {
             // CLI - display errors only if they're not already logged to STDERR
             ini_set('display_errors', 1);
         }

ErrorHandler.php

@@ -354,8 +354,8 @@ class ErrorHandler
      */
     private function reRegister(int $prev)
     {
-        if ($prev !== $this->thrownErrors | $this->loggedErrors) {
-            $handler = set_error_handler('var_dump');
+        if ($prev !== ($this->thrownErrors | $this->loggedErrors)) {
+            $handler = set_error_handler('is_int');
             $handler = \is_array($handler) ? $handler[0] : null;
             restore_error_handler();
             if ($handler === $this) {
@@ -490,7 +490,7 @@ class ErrorHandler
             $log = 0;
         } else {
             if (\PHP_VERSION_ID < (\PHP_VERSION_ID < 70400 ? 70316 : 70404)) {
-                $currentErrorHandler = set_error_handler('var_dump');
+                $currentErrorHandler = set_error_handler('is_int');
                 restore_error_handler();
             }
 
@@ -601,7 +601,7 @@ class ErrorHandler
         $sameHandlerLimit = 10;
 
         while (!\is_array($handler) || !$handler[0] instanceof self) {
-            $handler = set_exception_handler('var_dump');
+            $handler = set_exception_handler('is_int');
             restore_exception_handler();
 
             if (!$handler) {

ExceptionHandler.php

@@ -55,7 +55,7 @@ class ExceptionHandler
     public function __construct(bool $debug = true, string $charset = null, $fileLinkFormat = null)
     {
         $this->debug = $debug;
-        $this->charset = $charset ?: ini_get('default_charset') ?: 'UTF-8';
+        $this->charset = $charset ?: \ini_get('default_charset') ?: 'UTF-8';
         $this->fileLinkFormat = $fileLinkFormat;
     }
 
@@ -390,7 +390,7 @@ EOF;
     private function formatPath(string $path, int $line): string
     {
         $file = $this->escapeHtml(preg_match('#[^/\\\\]*+$#', $path, $file) ? $file[0] : $path);
-        $fmt = $this->fileLinkFormat ?: ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
+        $fmt = $this->fileLinkFormat ?: \ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format');
 
         if (!$fmt) {
             return sprintf('<span class="block trace-file-path">in <span title="%s%3$s"><strong>%s</strong>%s</span></span>', $this->escapeHtml($path), $file, 0 < $line ? ' line '.$line : '');