JSON encoding and decoding in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert an array to a JSON string.

PHP

<?php
$array = ['name' => 'Alice', 'age' => 25];
$json = json_[1]($array);
echo $json;
?>

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

Astringify

Bdecode

Cparse

Dencode

Attempts:

3 left

💡 Hint

Common Mistakes

Using json_decode instead of json_encode.

Trying to use json_parse or json_stringify which do not exist in PHP.

The json_encode function converts a PHP array into a JSON string.

2fill in blank

medium

Complete the code to convert a JSON string back to a PHP array.

PHP

<?php
$json = '{"name":"Bob","age":30}';
$array = json_[1]($json, true);
print_r($array);
?>

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

Adecode

Bstringify

Cparse

Dencode

Attempts:

3 left

💡 Hint

Common Mistakes

Using json_encode instead of json_decode.

Not passing true as the second argument to get an array.

The json_decode function converts a JSON string into a PHP variable. Passing true returns an associative array.

3fill in blank

hard

Fix the error in the code to correctly decode JSON into an object.

PHP

<?php
$json = '{"city":"Paris","country":"France"}';
$obj = json_decode($json, [1]);
echo $obj->city;
?>

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

A0

Bfalse

Cnull

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Passing true and then trying to access properties with -> instead of array keys.

Passing null which defaults to false but can be confusing.

Passing false or omitting the second argument returns an object. To access properties with ->, decode as an object.

4fill in blank

hard

Fill both blanks to encode an array and then decode it back to an associative array.

PHP

<?php
$data = ['x' => 10, 'y' => 20];
$json = json_[1]($data);
$array = json_[2]($json, true);
print_r($array);
?>

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

Aencode

Bdecode

Cparse

Dstringify

Attempts:

3 left

💡 Hint

Common Mistakes

Using json_decode first or in the wrong order.

Not passing true to json_decode to get an array.

First, use json_encode to convert the array to JSON. Then use json_decode with true to convert JSON back to an associative array.

5fill in blank

hard

Fill all three blanks to encode a nested array and decode it back as an object.

PHP

<?php
$info = ['person' => ['name' => 'Eve', 'age' => 28]];
$json = json_[1]($info);
$obj = json_[2]($json, [3]);
echo $obj->person->name;
?>

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

Aencode

Bdecode

Cfalse

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Passing true to json_decode and then trying to access properties with ->.

Using json_decode before json_encode.

Use json_encode to convert the array to JSON. Then use json_decode with false to decode JSON into an object, so you can access properties with ->.