Online PHP editor | refs for GKZXi

<?php $booklist = [ 'Peppa / Season 2 / 43 The Quarrel / Page 1', 'Nursery Rhymes / Wheels On The Bus / Page 1', 'Wonderskills / Starter Book 2 / Unit 1 At The Firehouse / Part 3 / Page 3', 'Oxford Phonics World / Level 2 Short Vowels / Unit 1 Short A / Page 7', 'Peppa / Season 2 / 43 The Quarrel / Page 1', 'Nursery Rhymes / Twinkle Twinkle / Page 1', 'Wonderskills / Starter Book 2 / Unit 1 At The Firehouse / Part 2 / Page 17', 'Oxford Phonics World / Level 1 The Alphabet / Unit 8 / Review W X Y Z / Page 2', 'Peppa / Season 2 / 42 Granny And Grandpas Attic / Page 1', 'Nursery Rhymes / The Phonics Song / Page 1', 'Wonderskills / Starter Book 2 / Unit 1 At The Firehouse / Part 2 / Page 4', 'Peter Pan / Level 1 / Page 1', 'Peppa / Season 2 / 42 Granny And Grandpas Attic / Page 1', 'Nursery Rhymes / The Phonics Song / Page 1', 'Donald Duck / Page 19', 'Donald Duck / Page 18', 'Oxford Phonics World / Level 1 The Alphabet / Unit 8 / Letter Z / Page 2', ]; $result = []; foreach ($booklist as $book) { $result[strtok($book, '/')] ??= $book; } var_export(array_values($result));