<?php
$data = array (
array(1, 9),
array(1, 3),
array(1, 5),
array(9, 2),
array(9, 7),
);
$col0 = array_column($data, 0);
$col1 = array_column($data, 1);
$min0 = min($col0);
$min1 = min($col1);
$mincol0 = array_intersect($col0, [$min0]);
$mincol1 = array_intersect($col1, [$min1]);
var_dump(array_keys(array_intersect_key($col1, $mincol0),min(array_intersect_key($col1, $mincol0))));
Var_dump($mincol0, $mincol1);
preferences:
52.43 ms | 402 KiB | 5 Q