permission denied : copy / writing file (laravel / php) - php

Question

I use on my application some fonctions about files. creation of files, copy/create from a directory to another, update. On my localhost, all is okay, that's work.
The main purpose is to have a manager for translation on the website.
rights of parent directories : 755
I have error :
1) if files doesn't exist the error is
copy(/blabla/path.php): failed to open stream: Permission denied
2) if I create files before (touch + chown on usr:usr) with basic rights (644) or with updated rights (775) :
file_put_contents(/blabla/path.php) : failed to open stream: Permission denied
On my localhost :
right of directories : 755
right of files : 644
I also tried to clean php cache (php artisan cache:clear)
edit :
I use 2 functions :
copy (who copy default translate file in the directory of second langage) and file_put_contents (who edit file)
public function replaceSlugs(Array $slugs,$filename, $lang)
{
$file=$this->path2File($filename,$lang);
if(!file_exists($file)){$this->duplicateFile($lang,$filename);}
$translate="<?php return ".var_export($slugs,true).";";
return file_put_contents ( $file , $translate, LOCK_EX );
}
private function duplicateFile($lang,$filename)
{
copy($this->path2File($filename),$this->path2File($filename,$lang));
}
private function path2File($filename,$lang="en")
{
return resource_path('lang/'.$lang.'/'.$filename.'.php');
}

Answer 1

Solution is Risky but it will do the trick
Give your folders full permission & clear Cache
Something like this.
sudo chmod -R 777 public/lang/en
if you don't give 777 permission you will also stuck while unit Test.