Iterate through a php multi dimensional array with specific condition - php

Question

I have a php array below and i want to know how to get number of companies who did a training course. Look below:
Array
(
[0] => Array
(
[date_creation] => Apr 10, 2021 10:17 pm
[idformation] => 84
[idsociete] => 7
[training] => ELECTRICAL SAFETY TRAINING
[company] => ALUCAM
)
[1] => Array
(
[date_creation] => Apr 10, 2021 10:55 pm
[idformation] => 84
[idsociete] => 7
[training] => ELECTRICAL SAFETY TRAINING
[company] => ALUCAM
)
[2] => Array
(
[date_creation] => Apr 12, 2021 03:27 pm
[idformation] => 104
[idsociete] => 201
[training] => FORKLIFT, JLG SCISSOR LIFT, AERAL PLATFORM
[company] => US EMBASSY
)
);
Each array represents the record of a worker in the database from a company say Alucam and did training Electrical safety.
So from the array above i want to get something like:
2 Alucams did electrical safety as seen in the array.
I just need a clue on how to get the count of persons who did a particular training from the array.
Please help

Answer 1

I assume you can have the same training from different companies, opposite case you can simplified the code.
Input data (I simplified your input array, including only the fields I need):
$workers = array(array("training" => "ELECTRICAL SAFETY TRAINING", "company" => "ALUCAM"),
array("training" => "ELECTRICAL SAFETY TRAINING", "company" => "ALUCAM"),
array("training" => "FORKLIFT, JLG SCISSOR LIFT, AERAL PLATFORM", "company" => "US EMBASSY"),
array("training" => "FORKLIFT, JLG SCISSOR LIFT, AERAL PLATFORM", "company" => "ALUCAM")
);
Php code:
$trainingCount = array();
foreach($workers as $worker) {
$training = $worker["training"];
$company = $worker["company"];
if(! array_key_exists($training, $trainingCount)) {
$trainingCount[$training] = array();
}
if(! array_key_exists($company, $trainingCount[$training])) {
$trainingCount[$training][$company] = 0;
}
$trainingCount[$training][$company]++;
}
Result:
array('ELECTRICAL SAFETY TRAINING' => array('ALUCAM' => 2), 'FORKLIFT, JLG SCISSOR LIFT, AERAL PLATFORM' => array('US EMBASSY' => 1, 'ALUCAM' => 1));

Answer 2

Effectively you have a list of employees with their training listed in a comma separated list?
So basically you need to iterate through the list stripping out the information you require (company & training). Then every time you get a match you increment the matching data.
There are a few ways to do this the simplest would be to iterate through the results to create an array which looks something like...
$countArray = [
"Alucam" => [
"ELECTRICAL SAFETY TRAINING" = 2,
],
];
The code would look like:
$countArray = [];
// Generate the array
foreach ($array as $employee) {
$trainingList = array_map("trim", explode(",", $employee["training"]));
foreach ($trainingList as $training) {
$countArray[$employee["company"]][$training] = ($countArray[$employee["company"]][$training] ?? 0) + 1;
}
}
// Generate the output
foreach ($countArray as $companyName => $training) {
foreach ($training as $trainingName => $trainingCount) {
echo "{$trainingCount} {$companyName} did {$trainingName}", PHP_EOL;
}
}
/*
Output:
2 ALUCAM did ELECTRICAL SAFETY TRAINING
1 US EMBASSY did FORKLIFT
1 US EMBASSY did JLG SCISSOR LIFT
1 US EMBASSY did AERAL PLATFORM
*/
However, this does mean you can have "unusual" characters in array keys which could lead to problems further down the line. So you may do better with a slightly more complicated approach (i.e. having index arrays for the company and training names) which gives an array a little something like...
$countArray = [
'company' => [
0 => 'ALUCAM',
1 => 'US EMBASSY',
],
'training' => [
0 => 'ELECTRICAL SAFETY TRAINING',
1 => 'FORKLIFT',
2 => 'JLG SCISSOR LIFT',
3 => 'AERAL PLATFORM',
],
'count' => [
0 => [
0 => 2,
],
1 => [
1 => 1,
2 => 1,
3 => 1,
],
],
];
The code would look like:
// Generate the array
foreach ($array as $employee) {
if (false === ($companyIndex = array_search($employee["company"], $countArray["company"]))) {
$companyIndex = count($countArray["company"]);
$countArray["company"][] = $employee["company"];
}
$trainingList = array_map("trim", explode(",", $employee["training"]));
foreach ($trainingList as $training) {
if (false === ($trainingIndex = array_search($training, $countArray["training"]))) {
$trainingIndex = count($countArray["training"]);
$countArray["training"][] = $training;
}
$countArray["count"][$companyIndex][$trainingIndex] = ($countArray["count"][$companyIndex][$trainingIndex] ?? 0) + 1;
}
}
// Generate the output
foreach ($countArray["count"] as $companyKey => $companyCount) {
$companyName = $countArray["company"][$companyKey];
foreach ($companyCount as $trainingKey => $trainingCount) {
$trainingName = $countArray["training"][$trainingKey];
echo "{$trainingCount} {$companyName} did {$trainingName}", PHP_EOL;
}
}

Answer 3

You can use array_count_values and array_column to achieve something like this: You can modify as required.
$arr = [
['date_creation' => 'Apr 10, 2021 10:17 pm', 'idformation' => 84, 'idsociete' => 7, 'training' => 'ELECTRICAL SAFETY TRAINING', 'company' => 'ALUCAM'],
['date_creation' => 'Apr 10, 2021 10:17 pm', 'idformation' => 84, 'idsociete' => 7, 'training' => 'ELECTRICAL SAFETY TRAINING', 'company' => 'ALUCAM'],
['date_creation' => 'Apr 12, 2021 03:27 pm', 'idformation' => 104, 'idsociete' => 201, 'training' => 'FORKLIFT, JLG SCISSOR LIFT, AERAL PLATFORM', 'company' => 'US EMBASSY'],
];
$training = 'ALUCAM';
$companies = array_count_values(array_column($arr, 'company'))[$training]; // outputs: 2