- in_array: documentation ( source)
<?php
$user = [
'firstname' => 'first',
'middle' => 'middle',
'lastname' => 'last',
'address' => [
'street' => 'streeeeeet',
'housenumber' => '10'
]
];
$interestingKeys = [
'address',
'someOtherKey'
];
foreach ($user as $key => $val) {
//is it in the keys we're interested in, and is it an array (sub array of $user)?
if (in_array($key, $interestingKeys) && is_array($val)){
// Scan through inner loop
foreach ($val as $sub_val) {
echo "$sub_val\n";
}
}
}