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@ 2022-08-20T21:34:44Z

<?php

function interleave($students, $lessons) {
    $numStudents = count($students);
    $numLessons = count($lessons);
    
    if ( $numLessons >= $numStudents ) {
        $studentSliceSize = 1;
        $lessonSliceSize = intdiv($numLessons, $numStudents);
    }
    else {
        $studentSliceSize = intdiv($numStudents, $numLessons);
        $lessonSliceSize = 1;
    }
    
    $combinedArray = [];
    
    $nextStudent = 0;
    $nextLesson = 0;
    
    while ( $nextStudent < $numStudents || $nextLesson < $numLessons ) {
        $studentSlice = array_slice($students, $nextStudent, $studentSliceSize);
        array_push($combinedArray, ...$studentSlice);
        $nextStudent += $studentSliceSize;
        
        $lessonSlice = array_slice($lessons, $nextLesson, $lessonSliceSize);
        array_push($combinedArray, ...$lessonSlice);
        $nextLesson += $lessonSliceSize;
    }
    
    return $combinedArray;
}
 
var_dump(interleave(['John'], ['Maths']));

var_dump(interleave(['John'], ['Maths', 'Science']));
var_dump(interleave(['John', 'Mary'], ['Maths', 'Science']));
var_dump(interleave(['John', 'Mary', 'Sarah'], ['Maths', 'Science']));
var_dump(interleave(['John', 'Mary', 'Sarah', 'David'], ['Maths', 'Science']));
var_dump(interleave(['John', 'Mary', 'Sarah', 'David', 'Tim'], ['Maths', 'Science']));

var_dump(interleave(['John', 'Mary'], ['Maths', 'Science', 'Music']));
var_dump(interleave(['John', 'Mary'], ['Maths', 'Science', 'Music', 'English']));

Output for rfc.property-hooks, git.master, git.master_jit: array(2) { [0]=> string(4) "John" [1]=> string(5) "Maths" } array(3) { [0]=> string(4) "John" [1]=> string(5) "Maths" [2]=> string(7) "Science" } array(4) { [0]=> string(4) "John" [1]=> string(5) "Maths" [2]=> string(4) "Mary" [3]=> string(7) "Science" } array(5) { [0]=> string(4) "John" [1]=> string(5) "Maths" [2]=> string(4) "Mary" [3]=> string(7) "Science" [4]=> string(5) "Sarah" } array(6) { [0]=> string(4) "John" [1]=> string(4) "Mary" [2]=> string(5) "Maths" [3]=> string(5) "Sarah" [4]=> string(5) "David" [5]=> string(7) "Science" } array(7) { [0]=> string(4) "John" [1]=> string(4) "Mary" [2]=> string(5) "Maths" [3]=> string(5) "Sarah" [4]=> string(5) "David" [5]=> string(7) "Science" [6]=> string(3) "Tim" } array(5) { [0]=> string(4) "John" [1]=> string(5) "Maths" [2]=> string(4) "Mary" [3]=> string(7) "Science" [4]=> string(5) "Music" } array(6) { [0]=> string(4) "John" [1]=> string(5) "Maths" [2]=> string(7) "Science" [3]=> string(4) "Mary" [4]=> string(5) "Music" [5]=> string(7) "English" }

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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