[Solved] Multi-dimensional PHP array index

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Here you go: 

<?php
$array = array(
  array(1,2),
  array(3,4),
  array(5,6),
  array(7,8)
);

function processArray(&$array) {
    for ($i = 0; $i < count($array); $i++) {
        if ($array[$i][0] > 4) {
            $array[$i][0] = $array[$i][0] - 3;
        }
        if ($array[$i][1] < 5) {
            $array[$i][1] = $array[$i][1] + 3;
        }
    }
}

processArray($array);
print_r($array);

Outputs:

Array ( [0] => Array ( [0] => 1 [1] => 5 ) [1] => Array ( [0] => 3 [1] => 7 ) [2] => Array ( [0] => 2 [1] => 6 ) [3] => Array ( [0] => 4 [1] => 8 ) )

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solved Multi-dimensional PHP array index