Laravel php7 debian 7.5 site deployment has illegal hackers, don't know why

Question

I deployed laravel site on debian 7.5, apache2, php7. on my mac, the site is beautiful, but after the deployment, the site reports the following error message: all php files are utf-8 code, and php.ini shows that the default php7 set is utf-8, and also help me there, thanks in advance .

Error Exception in line Mbstring.php 351: iconv_strpos (): invalid character found in input line

in the string Mbstring.php 351 in HandleExceptions-> handleError ('8', 'iconv_strpos (): an illegal character was found in the input line', '/ var / www / stockhit / vendor / symfony / polyfill-mbstring / Mbstring.php', '351', array ('haystack' => 'J? `I 3 ؉ W" l', 'needle' => 'base64:', 'offset' => '0', 'encoding' => 'UTF- 8'))

Answer 1

- , - , indebian, : Base64:........, 'cipher' = > 'AES-256-CBC', doesnt , base64andsomechar, 32 , ~

Answer 2

Alextre ( ) . "base64:" APP_KEY .ENV , 32 ( ).

- Ubuntu 16.04LTS Xenial Nginx PHP 7.