cast to int for strpos result

Co-authored-by: John Paul E. Balandan, CPA <51850998+paulbalandan@users.noreply.github.com>

Author: samsonasik

utils/Rector/UnderscoreToCamelCaseVariableNameRector.php

@@ -104,7 +104,7 @@ public function refactor(Node $node): ?Node
 
         $underscorePosition = strpos($nodeName, '_');
         // underscore not found, or in the first char, skip
-        if ($underscorePosition === false || $underscorePosition === 0) {
+        if ((int) $underscorePosition === 0) {
             return null;
         }