WordPress FAQ

GENERAL

• Upload file size limit of wordpress

• apt update

• apt install -y vim

• vi .htaccess

php_value upload_max_filesize 200M
php_value post_max_size 200M
php_value max_execution_time 300
php_value max_input_time 300

• MySQL can’t initialize DB, dir not empty

• Add to mysql deployment-container

        args: 
        - "--ignore-db-dir=lost+found"

• WordPress Connect to DB fail

• msg: [Note] Access denied for user 'example username'@'x.x.x.x' (using password: YES)

• solution: wordpress can’t read env variables (so it kept default username: “example username”)

#change image to 
image: wordpress:5.6.0-php7.4

#ref: https://github.com/docker-library/wordpress/issues/576

• How to change a WordPress Multisite primary domain.

• wp-config.php

<?php
$domain = "your domain";
define('WP_HOME', 'http://'.$domain.'//');
define('WP_SITEURL', 'http://'.$domain.'//');
define( 'WP_ALLOW_MULTISITE', true );
...

...
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
define('DOMAIN_CURRENT_SITE', $domain);
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

/* That's all, stop editing! Happy blogging. */  // <--Before this line

• MySQL (Ref: https://wpengine.com/support/how-to-change-a-multi-site-primary-domain/)

• wp_options: value of “siteurl”, “home”.     (http)

• wp_#_options: each sub-blogs, also value of “siteurl”, “home”.      (http)

• wp_site: value of “domain”.

• wp_sitemeta: value of “siteurl”.   (http)

• wp_blogs: all column “domain”.

• Check version/status

• “Tools” -> “Site Health” -> “Info”

• Need access to FTP issue.

• Msg: ask for ftp credential

• Ans:

This is user’s permission problem that will be solved by method given below that worked for me.

step-1 : First open wp-config.php file of your wordpress installation folder.
step-2: Copy below code and paste it at the end of the wp-config.php file.

define('FS_METHOD','direct');

step-3: Now open your droplet access console and enter root as username and its password.
step-4: Copy below code and paste it into access console where you have to specify your plugin directory path and then hit enter.

chmod 777 /yourwebsitename/public/wp-content/plugins/

Note: Replace your website name in the place of yourwebsitename.
Thank you.

• ServerName not found 

• Msg:

• FQDN not found

• mysqli connection exception, server name not found

• Ans:

• Rebuild wordpress after cleaning all old data on disk. 

• Write parameter debug log 

$sudo vi ./your_wp_html/wp-includes/functions.php

---  functions.php ---
...
/**
* Simple helper to debug to the console
*
* @param $data object, array, string $data
* @param $context string  Optional a description.
*
* @return string
*/
function debug_to_console($data, $context = 'Debug in Console') {
    // Buffering to solve problems frameworks, like header() in this and not a solid return.
    ob_start();

    $output  = 'console.info(\'' . $context . ':\');';
    $output .= 'console.log(' . json_encode($data) . ');';
    $output  = sprintf('<script>%s</script>', $output);

    echo $output;
}
...
------


# Now Usage in any .php file


debug_to_console($xxx)

Result:

POSTS

• Order posts by last modified/update date

$sudo vi {your_wp_html}/wp-content/themes/{your_current_theme}/functions.php

---  functions.php ---
...
# Remove `$query->is_main_query()` check if needs 
function lmt_orderby_modified_posts( $query ) {
    if( $query->is_main_query() && !is_admin() ) {
        if ( $query->is_home() || $query->is_category() || $query->is_tag() ) {
            $query->set( 'orderby', 'modified' );
            $query->set( 'order', 'desc' );
        }
    }
}
add_action( 'pre_get_posts', 'lmt_orderby_modified_posts' );
...
------