Requirements

• PHP version must be at least 5.3.3 (7.2.34 installed)
• PHP version must not be 5.3.16 as Symfony won't work properly with it
• Vendor libraries must be installed
• cache/ directory must be writable
• log/ directory must be writable
• conf/ directory must be writable
• library/Proxy/ directory must be writable
• themes/ directory must be writable
• plugins/ directory must be writable
• public/ directory must be writable
• images/ directory must be writable
• date.timezone setting must be set
• Configured default timezone "UTC" must be supported by your installation of PHP
• json_encode() must be available
• session_start() must be available
• ctype_alpha() must be available
• token_get_all() must be available
• simplexml_import_dom() must be available
• detect_unicode must be disabled in php.ini
• PCRE extension must be available

Recommendations

• sendmail should be installed
• You should use at least PHP 5.3.4 due to PHP bug #52083 in earlier versions
• When using annotations you should have at least PHP 5.3.8 due to PHP bug #55156
• You should not use PHP 5.4.0 due to the PHP bug #61453
• You should use PHP 5.3.18+ or PHP 5.4.8+ to always get nice error messages for fatal errors in the development environment due to PHP bug #61767/#60909
• PCRE extension should be at least version 8.0 (8.41 installed)
• PHP-XML module should be installed
• mb_strlen() should be available
• iconv() should be available
• utf8_decode() should be available
• posix_isatty() should be available
• intl extension should be available
• intl extension should be correctly configured
• intl ICU version should be at least 4+
• a PHP accelerator should be installed
• short_open_tag should be disabled in php.ini
• magic_quotes_gpc should be disabled in php.ini
• register_globals should be disabled in php.ini
• session.auto_start should be disabled in php.ini
• PDO should be installed
• PDO should have some drivers installed (currently available: mysql, odbc, pgsql, sqlite)