Removing values from multidimensional array based on multidimentional whitelist - php

Question

I have the following white list:
private $conditionalFieldsWhitelist = [
'Basic Fields' => [
'contact_name',
'contact_lastname',
],
'Required Fields' => [
'some_required_field',
]
];
That I want to run agains an array that looks like this:
$myArray = [
'Basic Fields' => [
[
'field_name' => 'contact_name',
'field_readable' => $this->language->get('First Name'),
'field_type' => 'string',
'field_required' => 'no',
'field_placeholder' => $this->language->get('Type your first name')
], [
'field_name' => 'contact_lastname',
'field_readable' => $this->language->get('Last Name'),
'field_type' => 'string',
'field_required' => 'no',
'field_placeholder' => $this->language->get('Type your last name')
], [
'field_name' => 'contact_email',
'field_readable' => $this->language->get('Email Address'),
'field_type' => 'string',
'field_required' => 'yes',
'field_placeholder' => 'example#domain.com'
], [
'field_name' => 'contact_mobile',
'field_readable' => $this->language->get('Mobile Number'),
'field_type' => 'string',
'field_required' => 'yes',
'field_placeholder' => '[phone]'
]
],
'Required Fields' => [
[
'field_name' => 'some_required_field',
'field_readable' => $this->language->get('Required Field'),
'field_type' => 'string',
'field_required' => 'no',
],
],
'This Should Be Removed' => [
[
'field_name' => 'not_needed_field',
'field_readable' => $this->language->get('Required Field'),
'field_type' => 'string',
'field_required' => 'no',
]
]
];
Obviously this are watered down versions of the actual arrays.
My code to do this looks like so:
public function getConditionalFields()
{
$conditionalFields = $this->formFieldGroupingsViewHelper->getGroupedFields();
foreach ($conditionalFields as $group => $fields) {
if (in_array($group, array_keys($this->conditionalFieldsWhitelist)) === false) {
unset($conditionalFields[$group]);
continue;
}
foreach ($fields as $index => $field) {
if (in_array($field['field_name'], $this->conditionalFieldsWhitelist[$group]) === false) {
unset($conditionalFields[$group][$index]);
continue;
}
}
$conditionalFields[$group] = array_values($conditionalFields[$group]);
}
return $conditionalFields;
}
This, however, doesn't seem like it's very clean and makes use of the power of PHP.
Is there a simpler, better, neater way to do this? Something like a recursive array_intersect that works on array keys as well.
This is the outcome that I expect:
[
'Basic Fields' => [
[
'field_name' => 'contact_name',
'field_readable' => $this->language->get('First Name'),
'field_type' => 'string',
'field_required' => 'no',
'field_placeholder' => $this->language->get('Type your first name')
], [
'field_name' => 'contact_lastname',
'field_readable' => $this->language->get('Last Name'),
'field_type' => 'string',
'field_required' => 'no',
'field_placeholder' => $this->language->get('Type your last name')
]
],
'Required Fields' => [
[
'field_name' => 'some_required_field',
'field_readable' => $this->language->get('Required Field'),
'field_type' => 'string',
'field_required' => 'no',
],
]
]

Answer 1

I don't know if this is "better". It is different.
Code: (Demo)
$whitegroups = array_keys($conditionalFieldsWhitelist); // only necessary if multiple groups are possible in your project
foreach ($myArray as $group => $field_sets) {
if (in_array($group, $whitegroups)) {
$whitesubsets = $conditionalFieldsWhitelist[$group]; // only filter subsets that pass the group check
$result[$group] = array_filter($field_sets, function($set) use ($whitesubsets) {
return in_array($set['field_name'],$whitesubsets); // filter the subsets
});
}
}
var_export($result);
Or: (with array_intersect_key())
$myArray = array_intersect_key($myArray, $conditionalFieldsWhitelist); // filter the groups/keys
foreach ($myArray as $group => $field_sets) {
$whitesubsets = $conditionalFieldsWhitelist[$group];
$result[$group] = array_filter($field_sets, function($set) use ($whitesubsets) {
return in_array($set['field_name'],$whitesubsets); // filter the subsets
});
}
var_export($result);
Or (with array_intersect_key() and modifying by reference):
$myArray = array_intersect_key($myArray, $conditionalFieldsWhitelist);
foreach ($myArray as $group => &$field_sets) { // modify by reference
$whitesubsets = $conditionalFieldsWhitelist[$group];
$field_sets = array_filter($field_sets, function($set) use ($whitesubsets) {
return in_array($set['field_name'],$whitesubsets);
});
}
var_export($myArray);
Output:
array (
'Basic Fields' =>
array (
0 =>
array (
'field_name' => 'contact_name',
'field_type' => 'string',
'field_required' => 'no',
),
1 =>
array (
'field_name' => 'contact_lastname',
'field_type' => 'string',
'field_required' => 'no',
),
),
)