Many PHP errors (syntax error)

Hi, I’ve installed nextcloud 12.0.2 on a debian server (debian 9) with PHP 7.0 (php -v returns :

PHP 7.0.19-1 (cli) (built: May 11 2017 14:04:47) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.0.19-1, Copyright (c) 1999-2017, by Zend Technologies

and nginx latest.
But I’ve got a lot of PHP errors in my admin pannel :

As a result, I’ve got some issue in nextcloud : for example, nextcloud can’t update files in an external storage (the error seems to be" stat(): stat failed for /disk/hd_1/Multimedia/ at /server/nextcloud/lib/private/Files/Storage/Local.php#135")

Here is my php/7.0/fpm/php.ini :
(I’m sorry, the text is too long to be on the forum)

Here is my nextcloud/config/confing.php :

$CONFIG = array (
  'instanceid' => 'oc4k6jk6y1iw',
  'passwordsalt' => 'epFq8g+/7b8uLx1sWvfzvhdjG+9TYl',
  'secret' => 'jZAdMmLK+lLWlgM4dBKs/F8L4OxDkuIVNuM36/r1018ONgHZ',
  'trusted_domains' => 
  array (
    0 => 'DOMAIN',
    1 => 'DOMAIN',
  'datadirectory' => '/disk/hd_1/nextcloud',
  'overwrite.cli.url' => 'https://DOMAIN',
  'dbtype' => 'mysql',
  'version' => '',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'USER',
  'dbpassword' => 'PASSWORD',
  'installed' => true,
  'memcache.local' => '\OC\Memcache\Redis',
  'redis' => array(
     'host' => 'localhost',
     'port' => 6379,

Can anyone help me?
Thank you very much.

Update please !

I just recognized your max post and upload sizes are quite small (8M/2M). Is the .user.ini file established within your nc directory with in case higher numbers?

I don’t use nginx but I guess its config and perhaps error log could also help.

Thank you for your help. I’ve changed the post max size in php.ini, but I think that it’s only .user.ini who defines this rule : I can upload big files (25 Go).
In the logs, I only have
2017/08/31 10:39:04 [crit] 536#536: *912 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: ####IP####, server:
But I don’t think that this error is linked with PHP errors.