- var_export: documentation ( source)
<?php
$array = [
["2" => 6, "5" => 1],
["2" => 1, "5" => 3],
];
$result = [];
foreach ($array as $row) {
foreach ($row as $k => $v) {
if (!isset($result[$k]) || $result[$k] < $v){
$result[$k] = $v;
}
}
}
var_export($result);