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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$matrix = [1,2,3,4,5];
$arr2 = array_chunk($matrix, 4);
print_r($arr2);
$arr3 = count($arr2) > 2 ? array_map(null, ...$arr2) : $arr2;
print_r($arr3);