Sorting Events by Date
Part of the Logic & Flow section of Coddy's PHP journey — lesson 62 of 68.
Challenge
EasyYou will receive two inputs: a JSON string representing an array of events, and a date string in YYYY-MM-DD format representing today's date.
The first input will be a JSON string in this format: [{"name":"Team Meeting","date":"2024-04-15","location":"Office"},{"name":"Conference","date":"2024-05-20","location":"Convention Center"},{"name":"Workshop","date":"2024-03-10","location":"Library"}]
The second input will be a date string in this format: 2024-04-01
Read both inputs and decode the JSON string into an events array. Filter the events to include only upcoming events (events whose date is greater than or equal to today's date).
Sort the upcoming events by their date in ascending order (earliest date first) using usort() with a custom comparison function. The comparison function should compare the dates of two events and return a value that determines their order.
After sorting, print each upcoming event in the following format:
Upcoming: [name] on [date] at [location]
Print each event on a separate line, in chronological order from earliest to latest date.
Input format:
- First line: A JSON string representing the events array with keys
name,date, andlocation - Second line: A date string in YYYY-MM-DD format representing today's date (example:
2024-04-01)
Expected output: Each upcoming event printed on a separate line in chronological order in the format: Upcoming: [name] on [date] at [location]
Try it yourself
<?php
// Read the JSON string of events
$eventsJson = fgets(STDIN);
$events = (array)json_decode($eventsJson, true);
// Read today's date
$todayDate = trim(fgets(STDIN));
// TODO: Write your code below
// Filter upcoming events (date >= today's date)
// Sort the upcoming events by date using usort()
// Print each upcoming event in the required format
?>All lessons in Logic & Flow
1Advanced Functions
Anonymous FunctionsClosures and 'use'Arrow FunctionsCallback FunctionsUsing 'call_user_func'Variable FunctionsPassing by ReferenceRecursive FunctionsRecap: Function Medley4Multi-dimensional Arrays
Creating a 2D ArrayAccessing 2D Array ElementsModifying 2D Array ElementsIterating with Nested Loops2D Associative ArraysRecap: Simple Grid Exercise2Advanced Array Manipulations
Adding with 'array_push'Removing with 'array_pop'Adding with 'array_unshift'Removing with 'array_shift'Merging Indexed ArraysMerging Associative ArraysExtracting with 'array_slice'Values with 'in_array'Keys with 'array_search'Recap: Playlist Exercise3Sorting Arrays
Sort Indexed Arrays AscendingSort Indexed Arrays DescendingSort Assoc Arrays by ValueSort Assoc Arrays by KeyNatural Order SortingCustom Sorting with 'usort'Recap: Leaderboard Sorting6Higher-Order Array Functions
Transforming with 'array_map''array_map' with Custom FuncFiltering with 'array_filter''array_filter' with Custom FunReducing with 'array_reduce'Walking with 'array_walk'Recap: Data Processing9Event Scheduler
Event DataAdding a New Event
Listing Upcoming EventsSorting Events by DateFiltering Events by MonthDisplaying a Countdown