Migration between environments in Wordpress - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What happens to URLs when migrating a WordPress site to a new domain?

You move your WordPress site from oldsite.com to newsite.com. What must you do to ensure all URLs work correctly?

A Delete all posts and recreate them with the new domain URLs.

B Only change the domain name in the hosting control panel; WordPress updates URLs automatically.

C Update the site URL and home URL in the WordPress database to the new domain.

D No changes needed; WordPress uses relative URLs that adjust automatically.

💡 Hint

Think about where WordPress stores the site address and how it builds links.

WordPress stores the site URL and home URL in the database. When migrating, these must be updated to the new domain so links and media URLs work correctly.

❓ component_behavior

intermediate

What is the effect of importing a WordPress database dump without updating serialized data?

You export your WordPress database from the old environment and import it into the new one. You do not update serialized data containing old URLs. What will happen?

A Only images will fail to load, but links remain correct.

B The site will work perfectly because serialized data is ignored by WordPress.

C The database import will fail with a syntax error.

D Some links and settings may break because serialized data length mismatches cause errors.

💡 Hint

Serialized data stores string lengths. What happens if the string changes but length does not?

Serialized data includes string lengths. If URLs change but lengths are not updated, WordPress cannot read the data correctly, causing broken links or settings.

🔧 Debug

advanced

Why does the WordPress site show a blank page after migration?

After migrating your WordPress site to a new server, the site shows a blank white page. Which option is the most likely cause?

A PHP memory limit is too low or a fatal PHP error occurred.

B The database user password is too long.

C The theme folder is empty but plugins are active.

D The .htaccess file is missing but WordPress does not use it.

💡 Hint

Check error logs or enable debugging to find PHP errors.

A blank page usually means a PHP fatal error or memory exhaustion. Checking error logs or enabling WP_DEBUG helps find the issue.

📝 Syntax

advanced

Which wp-config.php change is required when migrating to a new database?

You migrate your WordPress site to a new server with a different database name, user, and password. Which wp-config.php snippet correctly updates the database connection?

A define('DB_NAME', 'new_db');\ndefine('DB_USER', 'new_user');\ndefine('DB_PASSWORD', 'new_pass');

B define('DB_NAME', new_db);\ndefine('DB_USER', new_user);\ndefine('DB_PASSWORD', new_pass);

C DB_NAME = 'new_db';\nDB_USER = 'new_user';\nDB_PASSWORD = 'new_pass';

D set('DB_NAME', 'new_db');\nset('DB_USER', 'new_user');\nset('DB_PASSWORD', 'new_pass');

💡 Hint

Remember how constants are defined in PHP.

In wp-config.php, database credentials are set using the PHP define() function with string values in quotes.

❓ state_output

expert

What is the final site URL after this migration script runs?

Given this PHP snippet run after migrating a WordPress site, what will get_option('siteurl') return?

Wordpress

<?php
update_option('siteurl', 'https://newdomain.com');
update_option('home', 'https://newdomain.com');
$siteurl = get_option('siteurl');
echo $siteurl;
?>

A https://olddomain.com

B https://newdomain.com

C http://newdomain.com

D An empty string

💡 Hint

What does update_option do to the stored value?

update_option changes the stored value in the database. get_option then returns the updated value.

Practice

1. What is the main purpose of migrating a WordPress site between environments?

easy

A. To move the site safely from one place to another

B. To change the site's theme permanently

C. To delete all plugins and start fresh

D. To increase the site's loading speed automatically

Solution

1. Step 1: Understand migration meaning

   Migration means moving a site from one environment (like local or staging) to another (like live).

2. Step 2: Identify the main goal

   The goal is to move the site safely without losing data or breaking it.

3. Final Answer:

   To move the site safely from one place to another -> Option A

4. Quick Check:

   Migration = safe site move [OK]

Hint: Migration means moving site safely between places [OK]

Common Mistakes:

• Thinking migration changes themes automatically
• Assuming migration deletes plugins
• Believing migration speeds up site by itself

2. Which of the following is the correct way to update URLs after migrating a WordPress site?

easy

A. Change URLs only in the wp-config.php file

B. Manually edit URLs in the database using a search and replace tool

C. Leave URLs as they are; WordPress updates them automatically

D. Delete the .htaccess file to reset URLs

Solution

1. Step 1: Recognize URL update necessity

   After migration, URLs often need updating to match the new domain or path.

2. Step 2: Choose the correct method

   Using a search and replace tool on the database is the proper way to update all URLs safely.

3. Final Answer:

   Manually edit URLs in the database using a search and replace tool -> Option B

4. Quick Check:

   Update URLs with search and replace [OK]

Hint: Use search and replace tool on database URLs [OK]

Common Mistakes:

• Thinking wp-config.php controls URLs
• Assuming WordPress auto-updates URLs always
• Deleting .htaccess breaks site rules

3. After migrating a WordPress site manually, which step ensures the media files are correctly moved?

medium

A. Change the site URL in wp-config.php

B. Only export the database; media files move automatically

C. Reinstall all plugins to restore media files

D. Copy the wp-content/uploads folder to the new environment

Solution

1. Step 1: Identify media file location

   Media files are stored in the wp-content/uploads folder in WordPress.

2. Step 2: Ensure media files move

   Copying this folder to the new environment keeps all media intact.

3. Final Answer:

   Copy the wp-content/uploads folder to the new environment -> Option D

4. Quick Check:

   Media files = wp-content/uploads copy [OK]

Hint: Copy uploads folder to move media files [OK]

Common Mistakes:

• Thinking media files move with database only
• Reinstalling plugins does not restore media
• Changing wp-config.php does not move files

4. You migrated your WordPress site but see broken links and missing images. What is the most likely cause?

medium

A. You forgot to update URLs in the database after migration

B. You copied the uploads folder twice

C. You changed the site URL in the wp-config.php file correctly

D. You used a plugin to migrate the site

Solution

1. Step 1: Analyze symptoms

   Broken links and missing images usually mean URLs still point to the old site.

2. Step 2: Identify cause

   If URLs in the database are not updated, links break after migration.

3. Final Answer:

   You forgot to update URLs in the database after migration -> Option A

4. Quick Check:

   Broken links = URLs not updated [OK]

Hint: Broken links? Check database URLs first [OK]

Common Mistakes:

• Assuming copying uploads twice fixes links
• Thinking changing wp-config.php fixes broken links
• Believing plugins always fix URL issues automatically

5. You want to migrate a WordPress site from a local environment to a live server. Which sequence of steps is best practice?

hard

A. Install WordPress fresh on live, then copy themes and plugins manually

B. Copy wp-content folder only, then change site URL in wp-config.php

C. Export database, copy wp-content folder, update wp-config.php, replace URLs in database

D. Export database and import it on live, no need to copy files

Solution

1. Step 1: Export database and copy files

   Exporting the database and copying the wp-content folder moves content and media.

2. Step 2: Update configuration and URLs

   Update wp-config.php for database access and replace URLs in the database to match live site.

3. Final Answer:

   Export database, copy wp-content folder, update wp-config.php, replace URLs in database -> Option C

4. Quick Check:

   Full migration = DB export + files + config + URL update [OK]

Hint: Export DB, copy files, update config and URLs [OK]

Common Mistakes:

• Copying files without exporting database
• Changing wp-config.php without URL updates
• Installing fresh WordPress loses content