- array_map: documentation ( source)
- array_column: documentation ( source)
- max: documentation ( source)
<?php
$array = [
0 => [
'val' => 3,
'param' => 2
],
1 => [
'val' => 3,
'param' => 10
]
];
echo max(array_map(
array_column($a, 'param'),
$array
));