Created
May 5, 2021 08:28
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solution.php
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<?php declare(strict_types=1); | |
$sections = json_decode( | |
<<<'JSON' | |
[ | |
{ | |
"title": "Getting started", | |
"reset_lesson_position": false, | |
"lessons": [ | |
{"name": "Welcome"}, | |
{"name": "Installation"} | |
] | |
}, | |
{ | |
"title": "Basic operator", | |
"reset_lesson_position": false, | |
"lessons": [ | |
{"name": "Addition / Subtraction"}, | |
{"name": "Multiplication / Division"} | |
] | |
}, | |
{ | |
"title": "Advanced topics", | |
"reset_lesson_position": true, | |
"lessons": [ | |
{"name": "Mutability"}, | |
{"name": "Immutability"} | |
] | |
} | |
] | |
JSON, | |
true, | |
); | |
$lessonPosition = 0; | |
$result = array_map(static function (array $section, int $sectionPosition) use (&$lessonPosition): array { | |
$lessonPosition = $section['reset_lesson_position'] ? 0 : $lessonPosition; | |
return ['position' => $sectionPosition + 1] + ['lessons' => array_map(static function (array $lesson) use ($section, &$lessonPosition): array { | |
return ['position' => ++$lessonPosition] + $lesson; | |
}, $section['lessons'])] + $section; | |
}, $sections, array_keys($sections)); | |
var_dump($result); |
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