1. Requirements

1.1. PHP

PHP >= 7.2 (PHP 7.3 recommended)

1.1.1. PHP Extensions

1. bcmath, or GMP
2. ctype
3. gd
4. iconv
5. intl
6. json
7. mbstring
8. openssl
9. pcre
10. spl 

1.1.2. Necessity to raise the PHP version

PHP version

• 7.0
  • Null Coalescing Operator – ??
• 7.1
  • php-diff 1.13
  • [$a, $b, $c] = ['a', 'b', 'c'];
• 7.2
  • hashids 4.0 – mb_ord() function

cause for raise

• PHP end of support
• library dependency
• core dependency

1.2. Web server

Apache >= 2.4

Apache version

• 2.2
  • EOS December 2017

1.3. Database

SQL database system, one of:

1.3.1. Necessity to raise the Database version

DB version

• MariaDB 10.0.5 & MySQL 5.6.4
  • InnoDB Full-text Search support
• MariaDB 10.2.2 & MySQL 5.7.7
  • support index key prefixes up to 3072 bytes by default (optional)

cause for raise

• MariaDB end of support
• core dependency

2. Used Libraries