Moving values from one array to another in PHP - php

Question

I have tried doing this for a while and can't wrap my head around it. I have two arrays. One array that contains sensors information called $sendatas and another that contains where those sensors are allocated to called $zones.
I want to be able to create dynamic HTML checkboxes within a table row based on whether the sensor is allocated to a zone or not and if it is then show a checked checkbox and if it isn't then show an unchecked checkbox.
Here is an example of my arrays:
The $sendatas array:
[1] => Array
(
[hwserial] => 00002025
[name] => FG05 Room Temp
[serial] => 5
[chan] => 1
[alarmhigh] => 30
[alarmlow] => 5
[delay] => 10
)
[2] => Array
(
[hwserial] => 00002025 01
[name] => FG05 Kitchen 1 Freezer
[serial] => 5
[chan] => 2
[alarmhigh] => -10
[alarmlow] => -35
[delay] => 10
)
The $zones array:
[0] => Array
(
[serial] => 1
[idGrid] => 50
[name] => All Sensors
)
[1] => Array
(
[serial] => 1
[idGrid] => 52
[name] => Food Area
)
[2] => Array
(
[serial] => 2
[idGrid] => 50
[name] => All Sensors
)
[3] => Array
(
[serial] => 2
[idGrid] => 52
[name] => Food Area
)
[4] => Array
(
[serial] => 3
[idGrid] => 50
[name] => All Sensors
)
[5] => Array
(
[serial] => 3
[idGrid] => 52
[name] => Food Area
)
[6] => Array
(
[serial] => 4
[idGrid] => 50
[name] => All Sensors
)
Both of my zones are not the same length. What I want to be able to achieve is to create an array that looks like this by finding the serial keys that match from both arrays.
Array
(
[0] => Array
(
[hwserial] => 00001216
[name] => Fridge Office Thermal
[serial] => 1
[chan] => 1
[alarmhigh] => 8
[alarmlow] => -2
[delay] => 10
[idGrid1] => 50
[idGrid2] => 51
[idGrid3] => 52
[zonename1] => All Sensors
[zonename2] => Office
[zonename3] => Food Area
)
[1] => Array
(
[hwserial] => 00002025
[name] => FG05 Room Temp
[serial] => 5
[chan] => 1
[alarmhigh] => 30
[alarmlow] => 5
[delay] => 10
[idGrid] => 50
[idGrid] => Not Used
[idGrid] => 52
[zonename1] => All Sensors
[zonename2] => Not Used
[zonename3] => Food Area
)
I am pretty sure I can write the code for the checkboxes once I have this array formatted properly. I have tried using some foreach loops but just keep making a mess of it. I have so far tried this on and off for a few weeks hoping it would just come to me but it hasn't. Any help appreciated.

Answer 1

Based on what you said you're trying to do with this, I think it looks like the array you're trying to create will not be that easy to work with. I think your sensors array is fine, and you just need to focus on the $zones array.
foreach ($zones as $zone) {
$zones_sensors[$zone['idGrid']]['name'] = $zone['name'];
$zones_sensors[$zone['idGrid']]['sensors'][$zone['serial']] = true;
}
This will reorganize the data in your $zones array into this format:
$zones_sensors = [
50 => ['name' => 'All Sensors', 'sensors' => [1 => true, 2 => true, 3 => true]],
51 => ['name' => 'Office', 'sensors' => [1 => true]],
52 => ['name' => 'Food Area', 'sensors' => [1 => true, 2 => true, 3 => true]]
];
This provides the two things you need to output the checkboxes as you described.
A complete list of zones
An indexed collection of serials associated with each zone.
You can use it to output headers for all the zones
foreach ($zones_sensors as $zone_id => $zone) {
// output one row with headers for zones
echo $zone['name']; // (formatting up to you)
}
Then when you output the sensors it will be easy to find which zones they're allocated to.
foreach ($sendatas as $sensor) { // make a row for each sensor
foreach ($zones_sensors as $zone_id => $zone) { // iterate the full list of zones
// check if the sensor is allocated to that zone
if (isset($zone['sensors'][$sensor['serial']])) {
// checkbox is checked
} else {
// checkbox is unchecked
}
}
}

Answer 2

This should just be a matter of creating a new array (let's call it $combined) that is a clone of one of the $sendatas array but uses the [serial] as a key so that you can target specific item. You would loop through the $zones array and for each item check if the [serial] is found in $combo and if a match is found inject the [idgrid] and [name] as a sub array for $combined['serial']. As you have not used sub array you could add a counter to add an incrementing number of values.

Answer 3

Something along the lines of this should do the trick:
$results = [];
foreach ($sendatas as $sensor) {
$zone_counter = 0;
foreach ($zones as $zone) {
if ($zone['serial'] == $sensor['serial']) {
$zone_counter++;
$sensor['idGrid' . $zone_counter] = $zone['idGrid'];
$sensor['zonename' . $zone_counter] = $zone['name'];
}
}
$results[] = $sensor;
// if you only want $results to contain sensors that actually have zones,
// wrap it in an if-statement:
// if ($zone_counter > 0) {
// $results[] = $sensor;
// }
}
print_r($results);
Note that this won't give you any sensors with matching zones with the data you provided, because those two sensors both have [serial] => 5 and all your zones have [serial] => 1 through 4. If you want to match by some other key instead of serial, just change the if-statement.