Reading and writing settings in Wordpress - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the output of this WordPress settings retrieval code?

Consider this code snippet that reads a setting from the WordPress options table:

 $value = get_option('my_plugin_setting', 'default');
echo $value;

Assuming the option 'my_plugin_setting' is not set in the database, what will be printed?

Wordpress

$value = get_option('my_plugin_setting', 'default');
echo $value;

A Prints 'default'

B Causes a fatal error

C Prints NULL

D Prints an empty string

💡 Hint

Check what the second parameter of get_option does.

The second parameter of get_option is the default value returned if the option does not exist. Here, it returns 'default'.

❓ state_output

intermediate

What is the value of the option after this code runs?

Given this code snippet:

 update_option('my_plugin_setting', 'blue');
update_option('my_plugin_setting', 'red');
$color = get_option('my_plugin_setting');
echo $color;

What will be the output?

Wordpress

update_option('my_plugin_setting', 'blue');
update_option('my_plugin_setting', 'red');
$color = get_option('my_plugin_setting');
echo $color;

A blue

B red

C NULL

D An error is thrown

💡 Hint

Think about what update_option does when called twice with the same key.

update_option overwrites the existing option value. The last call sets it to 'red'.

📝 Syntax

advanced

Which option causes a syntax error when saving settings?

Which of the following code snippets will cause a syntax error when trying to save a setting in WordPress?

A update_option('my_setting', array('a' => 1));

B update_option('my_setting', 'value');

C update_option('my_setting' 'value');

D update_option('my_setting', 123);

💡 Hint

Look carefully at the commas between function arguments.

Option C is missing a comma between the two arguments, causing a syntax error.

🔧 Debug

advanced

Why does this code fail to save the setting?

This code tries to save a setting but it does not persist:

 $setting = 'dark_mode';
update_option($setting, true);
if(get_option('darkmode')) {
  echo 'Enabled';
} else {
  echo 'Disabled';
}

What is the reason?

Wordpress

$setting = 'dark_mode';
update_option($setting, true);
if(get_option('darkmode')) {
  echo 'Enabled';
} else {
  echo 'Disabled';
}

A get_option requires a default value parameter

B update_option cannot save boolean values

C The variable $setting is not defined

D The option name is inconsistent between update_option and get_option

💡 Hint

Check the option names used in update_option and get_option calls.

update_option saves the value under the option name 'dark_mode' (from $setting), but get_option('darkmode') checks a different name without the underscore. Thus, get_option returns a falsey value (empty string or false), causing 'Disabled' to be printed, making it seem like the setting wasn't saved.

🧠 Conceptual

expert

Which option best describes how WordPress stores settings saved with update_option?

When you use update_option('my_setting', $value) in WordPress, how is the data stored internally?

A It stores the value serialized in the wp_options table under the option_name 'my_setting'

B It stores the value in a transient cache that expires after 1 hour

C It stores the value as plain text in a custom file in the wp-content folder

D It stores the value encrypted in the usermeta table

💡 Hint

Think about where WordPress stores options by default.

WordPress stores options in the wp_options database table. Complex data types are serialized before storage.