saveBlob to public dir

saveBlob.php

<?php
if (!function_exists('saveBlob')) {
    function saveBlob($blobdata = 'blobdata', $dir = 'blobdata')
    {
        //$blobdata head : data:image/jpeg;base64,
        $blobdata = request($blobdata);
        list($type, $blobdata) = explode(';', $blobdata);
        list(, $blobdata) = explode(',', $blobdata);
        $blobdata = base64_decode($blobdata);

        $download_key = \Faker\Provider\Uuid::uuid() . date('_Y_m_d');
        $fileExtension = last(explode('/', $type));

        if (!is_dir($dir) || !is_dir(public_path($dir))) {
            $dir = public_path($dir);
            mkdir($dir, 0777, true);
        }
        $save_to = "{$dir}/{$download_key}.{$fileExtension}";

        $write = file_put_contents($save_to, $blobdata);

        if ($write) {
            return [
                'saved' => true,
                'download_url' => url("/{$save_to}")
            ];
        }
        return [
            'saved' => false,
            'err' => true,
            'err_message' => 'can not save to ' . $save_to
        ];
    }
}
?>