This code store a base64 image using the Laravel's filesytem (File Storage) methods

savefile.php

$image_64 = $data['photo']; //your base64 encoded data

$extension = explode('/', explode(':', substr($image_64, 0, strpos($image_64, ';')))[1])[1];   // .jpg .png .pdf

$replace = substr($image_64, 0, strpos($image_64, ',')+1); 

// find substring fro replace here eg: data:image/png;base64,

$image = str_replace($replace, '', $image_64); 

$image = str_replace(' ', '+', $image); 

$imageName = Str::random(10).'.'.$extension;

Storage::disk('public')->put($imageName, base64_decode($image));

Hola trato de usar esté código y me da el siguiente error "Undefined array key 1"