app/code/community/Aoe/TemplateHints/Helper/ClassInfo.php
public function findFileAndLine($className) {
        $result = false;
        $fullPath = $this->searchFullPath($this->getFileFromClassName($className));
        if ($fullPath) {
            $result = array('file' => $fullPath, 'line' => 0);
            $lineNumber = $this->getLineNumber($fullPath, '/class\s+'.$className.'/');
            if ($lineNumber) {
                $result['line'] = $lineNumber;
            }
        }
        return $result;
    }
public function findFileAndLine($className) {
        $result = false;
        $fullPath = $this->searchFullPath($this->getFileFromClassName($className));
        if ($fullPath) {
            $result = array('file' => $fullPath, 'line' => 0);
            $lineNumber = $this->getLineNumber($fullPath, '/class\s+'.$className.'/');
            if ($lineNumber) {
                $result['line'] = $lineNumber;
            }
        }
        return $result;
    }
Find file and line of the class statement

@param $className
@return bool|array