PHP

PHP

PHP - Troubleshooting

Use phpinfo() to check PHP configuration

  • Create a file phpinfo.php in the root directory of the website

    <?php
  phpinfo();
?>

  • Access the file in browser

    • http://$CONTEXT_PATH/phpinfo.php

Cheatsheet - CLI

List loaded PHP modules

php -m

Display PHP configuration

php -i[nfo]

Display PHP config file names

php --ini

Run PHP script

php -f $script

PHP FPM

Cheatsheet - PHP FPM

List PHP-FPM pools
ls /etc/php-fpm.d/
Show PHP-FPM error log
tail -f /var/log/php-fpm/error.log
NGINX Website permission settings

Wordpress

Wordpress - wp-config.php

Wordpress - Troubleshotting

WP-CLI

Cheatsheet - WP-CLI

  • Must be run in the root directory of the WordPress installation, with wp-config.php configured.
Show WP-CLI info
wp cli info
List installed plugins
wp plugin list
List installed themes
wp theme list
Update site URL
wp search-replace 'http://example.dev' 'http://example.com' --dry-run
Regenerates thumbnails for one or more attachments
wp media regenerate

Takeaway

Caveats for updating site URL

  • Update values in wp_options table

    UPDATE wp_options SET option_value = replace(option_value, 'http://example.dev', 'http://example.com')
WHERE option_name = 'home' OR option_name = 'siteurl';

  • Search occurrences in text files, including but not exclusive

    • Assets URL hardcoded in CSS files, such as background-image URL.

  • Search occurrences in database

    Find other options hardcoding the URL

    SELECT * FROM wp_options WHERE option_value LIKE '%keyword%'

WooCommerce

WooCommerce - REST API

WooCommerce - Logging

  • WP Admin -> WooCommerce -> Status -> Logs

Composer

  • Installation

    • On Fedora / RHEL, use REMI repository, beware of PHP version, use DNF module to switch to ensure consistency.

Cheatsheet - Composer

List installed packages

composer show

Show environment

composer diagnose
Checking composer.json: WARNING
No license specified, it is recommended to do so. For closed-source software you may use "proprietary" as license.
require.wpackagist-plugin/wpforms-lite : exact version constraints (1.8.5.2) should be avoided if the package follows semantic versioning
Checking platform settings: OK
Checking git settings: OK git version 2.39.3
Checking http connectivity to packagist: OK
Checking https connectivity to packagist: OK
Checking github.com rate limit: OK
Checking disk free space: OK
Composer version: 2.6.5
PHP version: 8.2 - Package overridden via config.platform, actual: 8.2.13
PHP binary path: /usr/bin/php
OpenSSL version: OpenSSL 1.1.1k  FIPS 25 Mar 2021
cURL version: 7.61.1 libz 1.2.11 ssl OpenSSL/1.1.1k
zip: extension present, unzip present, 7-Zip not available

Search for packages

composer search $package

Install a single package without updating other dependencies

This is the recommended way to update dependencies in production, so no implicit update will be triggered.

composer require $package --no-update
composer update $package
# composer require wpackagist-plugin/avif-support --no-update
# Updating composer.json
Using version ^1.0 for wpackagist-plugin/avif-support
./composer.json has been updated
 
# composer update wpackagist-plugin/avif-support
# Updating composer.lock
Loading composer repositories with package information
Updating dependencies
Lock file operations: 1 install, 0 updates, 0 removals
  - Locking wpackagist-plugin/avif-support (1.0.4)
Writing lock file
Installing dependencies from lock file (including require-dev)
Nothing to install, update or remove
Generating autoload files
1 package you are using is looking for funding.
Use the `composer fund` command to find out more!
No security vulnerability advisories found.
Red Hat - CockpitOracle Cloud