lib/FileWrapper.php
protected function validMimeType($input): void
    {
        if (is_null($this->path)) {
            throw \AWonderPHP\FileWrapper\NullPropertyException::propertyIsNull('path');
        }
        if (! is_null($input)) {
            if (! is_string($input)) {
                throw \AWonderPHP\FileWrapper\TypeErrorException::mimeWrongType($input);
            }
            $input = trim(strtolower($input));
            try {
                $input = $this->mimeTypoFix($input);
            } catch (\ErrorException $e) {
                error_log($e->getMessage());
                $this->internalError = true;
                return;
            }
            if (in_array($input, $this->validMime)) {
                $this->mime = $input;
                return;
            }
        }
        // do what we can
        if ($input == "application/octet-stream") {
            $input = null;
        }
        $error = false;
        if (! is_null($input)) {
            $arr = explode('/', $input);
            if (count($arr) != 2) {
                $error = true;
            } elseif (! in_array($arr[0], array('application',
                                                'audio',
                                                'font',
                                                'image',
                                                'multipart',
                                                'text',
                                                'video'))) {
                $error = true;
            }
            if ($error) {
                if (function_exists('finfo_open')) {
                    if ($finfo = finfo_open(FILEINFO_MIME_TYPE)) {
                        if ($mime = finfo_file($finfo, $this->path)) {
                            try {
                                $this->mime = $this->mimeTypoFix($mime);
                            } catch (\ErrorException $e) {
                                error_log($e->getMessage());
                                $this->internalError = true;
                            }
                            finfo_close($finfo);
                            return;
                        }
                        finfo_close($finfo);
                    }
                }
            }
        }
        if (is_null($input)) {
            $input = 'application/octet-stream';
        }
        $this->mime = $input;
    }
protected function validMimeType($input): void
    {
        if (is_null($this->path)) {
            throw \AWonderPHP\FileWrapper\NullPropertyException::propertyIsNull('path');
        }
        if (! is_null($input)) {
            if (! is_string($input)) {
                throw \AWonderPHP\FileWrapper\TypeErrorException::mimeWrongType($input);
            }
            $input = trim(strtolower($input));
            try {
                $input = $this->mimeTypoFix($input);
            } catch (\ErrorException $e) {
                error_log($e->getMessage());
                $this->internalError = true;
                return;
            }
            if (in_array($input, $this->validMime)) {
                $this->mime = $input;
                return;
            }
        }
        // do what we can
        if ($input == "application/octet-stream") {
            $input = null;
        }
        $error = false;
        if (! is_null($input)) {
            $arr = explode('/', $input);
            if (count($arr) != 2) {
                $error = true;
            } elseif (! in_array($arr[0], array('application',
                                                'audio',
                                                'font',
                                                'image',
                                                'multipart',
                                                'text',
                                                'video'))) {
                $error = true;
            }
            if ($error) {
                if (function_exists('finfo_open')) {
                    if ($finfo = finfo_open(FILEINFO_MIME_TYPE)) {
                        if ($mime = finfo_file($finfo, $this->path)) {
                            try {
                                $this->mime = $this->mimeTypoFix($mime);
                            } catch (\ErrorException $e) {
                                error_log($e->getMessage());
                                $this->internalError = true;
                            }
                            finfo_close($finfo);
                            return;
                        }
                        finfo_close($finfo);
                    }
                }
            }
        }
        if (is_null($input)) {
            $input = 'application/octet-stream';
        }
        $this->mime = $input;
    }
Sets the MIME type the file will be served with. Does not compensate for all errors in
declared MIME types but will compensate for some.

@param null|string $input A MIME type.

@psalm-suppress RedundantConditionGivenDocblockType

@return void