Query parameters in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the 'id' query parameter from the request.

Laravel

$id = $request->[1]('id');

Drag options to blanks, or click blank then click option'

Ainput

Bquery

Cparam

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using input() instead of query() to get query parameters.

Using get() which is not a method on the request object.

The query method retrieves query parameters from the URL in Laravel.

2fill in blank

medium

Complete the code to check if the 'page' query parameter exists in the request.

Laravel

if ($request->[1]('page')) {
    // do something
}

Drag options to blanks, or click blank then click option'

Ahas

Bfilled

Ccontains

Dexists

Attempts:

3 left

💡 Hint

Common Mistakes

Using exists() which is not a Laravel request method.

Using contains() which is for collections, not request.

The has method checks if a query parameter is present in the request.

3fill in blank

hard

Fix the error in the code to get all query parameters as an array.

Laravel

$params = $request->[1]();

Drag options to blanks, or click blank then click option'

Aquery

Binput

Call

Dparams

Attempts:

3 left

💡 Hint

Common Mistakes

Using all() returns all input including POST data, not just query parameters.

Using params() which is not a Laravel request method.

The query() method without arguments returns all query parameters as an array.

4fill in blank

hard

Fill both blanks to get the 'sort' query parameter with a default value of 'asc'.

Laravel

$sort = $request->[1]('sort', [2]);

Drag options to blanks, or click blank then click option'

Aquery

B'asc'

C'desc'

Dinput

Attempts:

3 left

💡 Hint

Common Mistakes

Using input() instead of query() for query parameters.

Using 'desc' as default instead of 'asc'.

The query method can take a second argument as a default value if the parameter is missing.

5fill in blank

hard

Fill all three blanks to filter query parameters where values are not empty strings.

Laravel

$filtered = collect($request->[1]())->filter(function($value) {
    return $value [2] '';
});

$filteredArray = $filtered->[3]();

Drag options to blanks, or click blank then click option'

Aquery

B!==

CtoArray

Dinput

Attempts:

3 left

💡 Hint

Common Mistakes

Using input() instead of query() to get parameters.

Using != instead of !== which is strict comparison.

Forgetting to convert collection back to array.

We get all query parameters with query(), filter out empty strings using !==, and convert the collection back to array with toArray().

Practice

1. What is the purpose of query parameters in a Laravel application URL?

easy

A. To define the database schema

B. To style the webpage with CSS

C. To send extra information to control the data returned by the server

D. To store user session data on the server

Solution

1. Step 1: Understand what query parameters do

   Query parameters are parts of the URL that send extra info to the server, usually after a question mark.

2. Step 2: Identify their use in Laravel

   In Laravel, query parameters help control what data the server returns based on the extra info sent.

3. Final Answer:

   To send extra information to control the data returned by the server -> Option C

4. Quick Check:

   Query parameters control returned data = B [OK]

Hint: Query parameters add info after ? in URL to filter data [OK]

Common Mistakes:

• Confusing query parameters with database schema
• Thinking query parameters style the page
• Assuming query parameters store session data

2. Which is the correct Laravel syntax to get a query parameter named page from a request?

easy

A. $request->param('page')

B. $request->input('page')

C. $request->getQuery('page')

D. $request->query('page')

Solution

1. Step 1: Recall Laravel method for query parameters

   Laravel uses $request->query('key') to get query parameters from the URL.

2. Step 2: Match the correct syntax

   Among options, only $request->query('page') correctly accesses the query parameter named 'page'.

3. Final Answer:

   $request->query('page') -> Option D

4. Quick Check:

   Use $request->query('key') for query params = A [OK]

Hint: Use $request->query('key') to get query params in Laravel [OK]

Common Mistakes:

• Using $request->input() which also works but includes POST data
• Using non-existent methods like getQuery or param
• Confusing query() with input() for query parameters

3. Given this Laravel route code:

Route::get('/search', function (Request $request) {
    $term = $request->query('term', 'default');
    return $term;
});

What will be the output if the URL is /search?term=laravel?

medium

A. laravel

B. default

C. null

D. term

Solution

1. Step 1: Understand query parameter retrieval with default

   The code uses $request->query('term', 'default'), which returns the 'term' parameter if present, else 'default'.

2. Step 2: Check the URL query parameter

   The URL has ?term=laravel, so 'term' is 'laravel', not missing.

3. Final Answer:

   laravel -> Option A

4. Quick Check:

   Query param 'term' present = 'laravel' [OK]

Hint: If query param exists, default is ignored [OK]

Common Mistakes:

• Assuming default value is always returned
• Confusing parameter name with its value
• Expecting null when parameter is present

4. Identify the error in this Laravel code snippet that tries to get a query parameter sort:

Route::get('/items', function (Request $request) {
    $sort = $request->query['sort'];
    return $sort;
});

medium

A. Request class not imported

B. Using array syntax instead of method call for query parameters

C. Incorrect route method; should be post() instead of get()

D. Missing semicolon after return statement

Solution

1. Step 1: Check how query parameters are accessed

   The code uses $request->query['sort'], which is incorrect because query is a method, not an array.

2. Step 2: Correct syntax for query parameters

   The correct way is $request->query('sort') to get the 'sort' parameter.

3. Final Answer:

   Using array syntax instead of method call for query parameters -> Option B

4. Quick Check:

   Use $request->query('key'), not $request->query['key'] [OK]

Hint: query() is a method, not an array; use parentheses [OK]

Common Mistakes:

• Using square brackets instead of parentheses
• Confusing get() with query() method
• Assuming query is a property, not a method

5. You want to get a query parameter filter in Laravel but provide a default value of all if it is missing or empty. Which code correctly handles this?

hard

A. $filter = $request->query('filter') ?: 'all';

B. $filter = $request->input('filter', 'all');

C. $filter = $request->query('filter', 'all');

D. $filter = $request->query('filter') ?? 'all';

Solution

1. Step 1: Understand default value behavior in query()

   The second argument in query('filter', 'all') returns 'all' only if the parameter is missing, but not if empty.

2. Step 2: Handle empty values as well

   Using $request->query('filter') ?: 'all' returns 'all' if the parameter is missing or empty (falsy).

3. Step 3: Check other options

   $filter = $request->input('filter', 'all'); uses input() which includes POST data, not just query. $filter = $request->query('filter') ?? 'all'; uses null coalescing which does not treat empty string as missing.

4. Final Answer:

   $filter = $request->query('filter') ?: 'all'; -> Option A

5. Quick Check:

   Use ?: to handle missing or empty query params = C [OK]

Hint: Use ?: to cover missing or empty query parameters [OK]

Common Mistakes:

• Assuming default in query() covers empty strings
• Using input() which mixes POST and query data
• Using ?? which ignores empty strings