How to install PHP 8?

A vanilla WP 5.6 site that works with PHP 7.4.x does not work with PHP 8.0. Throws a bad gateway 502 error after PHP 8 upgrade

Code:

real    0m21.585s
user    0m21.455s
sys    0m0.022s
./sapi/cgi/php-cgi -T10 /svr-setup/php_pgo_training_scripts/index.php
PHP Fatal error:  Uncaught ArgumentCountError: parse_str() expects exactly 2 arguments, 1 given in /svr-setup/php_pgo_training_scripts/standard_calls.php:107
Stack trace:
#0 /svr-setup/php_pgo_training_scripts/standard_calls.php(107): parse_str()
#1 /svr-setup/php_pgo_training_scripts/standard_calls.php(70): run_standard_calls()
#2 /svr-setup/php_pgo_training_scripts/index.php(84): run_standard()
#3 {main}
  thrown in /svr-setup/php_pgo_training_scripts/standard_calls.php on line 107
Status: 500 Internal Server Error
Content-type: text/html; charset=UTF-8

So PGO is not working with PHP 8? Related to JIT? There are more errors related to /svr-setup/php_pgo_training_scripts/ folder.

Code:

WPPLUGINS_ALL='n'

VHOSTCTRL_CLOUDFLAREINC='y'
CLOUDFLARE_ZLIB='y'

ENABLEMOTD_CSFMSG='n'         # motd banner csf message alert disaply
ENABLEMOTD_LINKSMSG='n'       # motd centminmod.com links bookmark alert display
DISABLE_IPVSIX='y'

AUTOTUNE_CLIENTMAXBODY='y'

## FOR PHP 7.4+
FPM_WAKEUP_PATCH='y'

AUTODETECPHP_OVERRIDE='y'
 
##For Linux Kernel  > 5.1.x
NGINX_IOURING_PATCH_BETA='y'

##Upgrading NGINX. Disable, if custom configs
NGINX_ALLOWOVERRIDE='y'

#NGINX_FATLTO_OBJECTS='n'        # enable -ffat-lto-objects flag for nginx builds - much slower compile times
#NGINX_NOFATLTO_OBJECTS='n'      # enable -fno-fat-lto-objects flag for nginx builds - much slower compile times

NGINX_DYNAMICTLS='y'
NGINX_SSLCACHE_ALLOWOVERRIDE='y'  
NGXDYNAMIC_BROTLI='y'
NGINX_LIBBROTLI='y'
AUTOHARDTUNE_NGINXBACKLOG='y'

MARIADB_INSTALLTENFOUR='y'
SET_DEFAULT_MYSQLCHARSET='utf8mb4'
 
LETSENCRYPT_DETECT='y'
DUALCERTS='y'
NGINX_HPACK='y'

GCC_FALIGN_FUNCTION='y'

LIBRESSL_SWITCH='n'
CLANG='n'
DEVTOOLSETSIX='n'
DEVTOOLSETSEVEN='n'
DEVTOOLSETEIGHT='n'
DEVTOOLSETNINE='y'
NGINX_DEVTOOLSETGCC='y'
GENERAL_DEVTOOLSETGCC='y'
CRYPTO_DEVTOOLSETGCC='y'
 
CUSTOM_CURLRPM='y'
CUSTOM_CURLRPMVER='7.69.0'       # custom curl/libcurl version

PHP_PGO='y'
PHP_PGO_ALWAYS='y'


PHPPGO_INDEXPATH='/home/nginx/domains/XX/public/index.php'
#PHPPGO_INDEXPATH_TWO='/home/nginx/domains/XX/public/index.php'

PHP_TUNING='y'

PHP_BROTLI='y'
PHP_LZFOUR='y'
PHP_LZF='y'
PHP_ZSTD='y'
 
ZSTD_LOGROTATE_NGINX='y'
ZSTD_LOGROTATE_PHPFPM='y'
 
MARCH_TARGETNATIVE_ALWAYS='y'

PHPFINFO='y'
WP_FASTCGI_CACHE='y'
LETSENCRYPT_DETECT='y'
PHP_UPDATEMAINTENANCE='y'
MARIADB_UPDATEMAINTENANCE='y'

SSL_PROTOCOL_MODERN='y'
#NGINX_MODSECURITY_MAXMIND='y'
#NGINX_MODSECURITY='y'

WPCLI_CE_QUERYSTRING_INCLUDED='y'

NGINX_STAPLE_CACHE_OVERRIDE='y'
NGINX_STAPLE_CACHE_TTL='86400'

CF_DNSAPI='y'

 

I never looked into this more thoroughly, yet. I will toy with Zen3 and Centminmod on the coming days

 

Just installed PHP 8.0.5 on a 1 GB (test) VPS.
Oof, that was not easy but it worked in the end

The compilation crashed on apprentice.lo because of too little memory, so I doubled the swap file from 1 GB to 2 GB.
With PGO enabled, total compile time was a whopping 45 minutes!

 

Good to hear, that's what I am about to do. The test server is a bit low on resources, but should be fine for the live site running with much more resources.