Available validation rules in Laravel - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What does the 'required' validation rule do in Laravel?

In Laravel, what is the behavior of the 'required' validation rule when applied to a form input?

A It checks if the input is a valid email address.

B It allows the input field to be empty or missing without error.

C It ensures the input field must be present and not empty.

D It validates that the input is a numeric value.

💡 Hint

Think about whether the field can be left blank or missing.

The 'required' rule makes sure the input is present in the request and is not empty. If missing or empty, validation fails.

❓ component_behavior

intermediate

What output does this Laravel validation produce?

Given this validation rule in a Laravel controller:

$request->validate(['age' => 'integer|min:18']);

What happens if the input 'age' is '17'?

A Validation fails because age is less than 18.

B Validation passes because 17 is an integer.

C Validation passes because min rule is ignored for integers.

D Validation fails because age is not a string.

💡 Hint

Check what the 'min:18' rule means for integers.

The 'min:18' rule requires the integer to be at least 18. Since 17 is less, validation fails.

📝 Syntax

advanced

Which validation rule syntax is correct for checking a valid email in Laravel?

Select the correct syntax to validate that an input named 'email' is a valid email address in Laravel.

A 'email' => 'required|email'

B 'email' => 'email|required'

C 'email' => 'email|required|numeric'

D 'email' => 'required|email_address'

💡 Hint

Order matters for readability but not for correctness; check rule names carefully.

The correct rule names are 'required' and 'email'. 'email_address' is invalid and 'numeric' conflicts with email.

🔧 Debug

advanced

Why does this Laravel validation rule cause an error?

Consider this validation rule:

'username' => 'required|min:3|max'

Why will this cause a validation error?

A The 'min' rule must come after 'max'.

B The 'max' rule is missing a value and causes a syntax error.

C The 'required' rule cannot be combined with 'min' or 'max'.

D The 'username' field must be numeric for 'min' and 'max' to work.

💡 Hint

Check if all rules have required parameters.

The 'max' rule requires a value like 'max:10'. Without it, Laravel throws an error.

❓ state_output

expert

What is the validation result for this Laravel rule with input 'tags'?

Given this validation rule:

'tags' => 'array|min:2'

And the input:

tags = ['php']

What is the validation result?

A Validation passes because 'array' rule ignores 'min'.

B Validation passes because 'min:2' applies only to strings.

C Validation fails because 'tags' is not a string.

D Validation fails because the array has fewer than 2 items.

💡 Hint

Consider how 'min' works with arrays in Laravel validation.

The 'min:2' rule requires the array to have at least 2 items. Since 'tags' has only 1, validation fails.