1.1 System Requirements

Minimum software

• Linux server with Apache or Nginx
• WordPress 6.0+
• PHP 8.1+ (8.2/8.3 recommended)
• MySQL 5.6+ or MariaDB (any supported version)

Required PHP directives

• memory_limit: 256M or higher
• post_max_size: 128M or higher
• upload_max_filesize: 128M or higher
• max_execution_time: 90s or higher
• max_input_time: 60s or higher
• max_input_vars: 1000 or higher (2000–4000 recommended for heavy admin pages)
• file_uploads: Enabled
• max_file_uploads: 20+

Required PHP extensions

• mysqli
• json
• mbstring
• openssl
• pcre
• dom
• xml
• zip
• zlib
• fileinfo
• hash

Recommended PHP extensions

• curl
• exif
• gd or imagick for image processing

Server features

• Pretty permalinks enabled (mod_rewrite or equivalent)
• CURL outbound connectivity to pro.radio and *.pro.radio
• Allow outbound connections to these IPs, if your firewall restricts egress:
  • 207.244.234.10
  • 144.126.155.33
  • 209.126.11.171

Quick test

• Use the Server Check plugin to validate limits and extensions.

Troubleshooting common limits

• “Are you sure you want to do this?” or failed imports: increase memory_limit, upload_max_filesize, post_max_size, and max_execution_time.
• White screen or random 4xx/5xx in admin: raise max_input_vars to 3000–10000 for large option pages.

How to change PHP settings on popular panels

cPanel

1. Open MultiPHP INI Editor > select your domain.
2. Set the directives listed above and save.
3. If needed, switch PHP version in MultiPHP Manager to 8.2/8.3.

; Optional .user.ini fallback (document root)
memory_limit=512M
post_max_size=256M
upload_max_filesize=256M
max_execution_time=120
max_input_time=90
max_input_vars=4000

Plesk

1. Domains > your domain > PHP Settings.
2. Edit values under “Common settings” and “Performance settings”.
3. Apply, then restart PHP-FPM if prompted.

DirectAdmin

1. User Level > Domain Setup > select domain.
2. PHP Settings or Select PHP Version > Options.
3. Adjust limits. If unavailable, add a .user.ini in the site root.

; .user.ini (preferred on PHP-FPM)
memory_limit=512M
post_max_size=256M
upload_max_filesize=256M
max_execution_time=120
max_input_time=90
max_input_vars=4000

Hostinger (hPanel)

1. hPanel > Websites > Manage > PHP Configuration.
2. Tab PHP Options and PHP Variables: set values and save.
3. If variables are locked, create .user.ini in the site root.

SiteGround (Site Tools)

1. Site Tools > Dev > PHP Manager > PHP version: set 8.2/8.3.
2. Open PHP Variables and add the directives and values.
3. Save. SiteGround uses PHP-FPM, so .user.ini overrides also work.

Bluehost

1. Advanced > cPanel > MultiPHP INI Editor.
2. Select your domain and set the directives. Save.
3. If needed, change version in MultiPHP Manager.

When .htaccess is acceptable

• Only on Apache with php_module. On PHP-FPM many hosts ignore php_value.

# .htaccess (use only if supported; remove if it triggers 500)
php_value memory_limit 512M
php_value post_max_size 256M
php_value upload_max_filesize 256M
php_value max_execution_time 120
php_value max_input_time 90

Always-safe WordPress override

// wp-config.php
define('WP_MEMORY_LIMIT', '512M');

Recommended target values for Pro Radio

• memory_limit: 512M for busy sites
• post_max_size: 256M
• upload_max_filesize: 256M
• max_execution_time: 120
• max_input_time: 90
• max_input_vars: 3000–10000 depending on plugins

Notes

• After changes, clear OPCache and any server cache.
• On Nginx, ensure client size limits are not lower than PHP:

  # nginx.conf
  client_max_body_size 256M;
  

• If your host blocks outbound traffic, allow the listed IPs and the pro.radio domains for template/library updates.