PHP - Count number of values in a specific index of multidimensional array - php

Question

I have a multidimensional array where I need to get the count of similar values in a specific index and create a new array with the results. I am using PHP 7.3.
For example, I need to count the number of similar values in index [3] .
Desired results MUFA-D = 2, BRD-IS = 3, JBC-BAK-B = 1.
[0] => Array
(
[0] => CHICAGO
[1] => 14
[2] => MUFFIN A LINE
[3] => MUFA-D
[4] => Arm Bearings - Check for play, lubricate if needed.
)
[1] => Array
(
[0] => CHICAGO
[1] => 14
[2] => MUFFIN A LINE
[3] => MUFA-D
[4] => Linkage - Check for wear and broken links.
)
[2] => Array
(
[0] => MEMPHIS
[1] => 05
[2] => BREADING LINE 1
[3] => BRD1-IS
[4] => Gear Box oil level
)
[3] => Array
(
[0] => MEMPHIS
[1] => 05
[2] => BREADING LINE 1
[3] => BRD1-IS
[4] => Bearings visual inspection
)
[4] => Array
(
[0] => MEMPHIS
[1] => 05
[2] => BREADING LINE 1
[3] => BRD1-IS
[4] => Electrical Plug condition
)
[5] => Array
(
[0] => CHICAGO
[1] => 02
[2] => JBC LINE 2
[3] => JBC-BAK-B
[4] => Plate separator shaft
)
)

Answer 1

Using a couple of useful builtin functions you can do
$in = [
['CHICAGO', '14', 'MUFFIN A LINE', 'MUFA-D', 'Arm Bearings - Check for play, lubricate if needed.'],
['CHICAGO', '14', 'MUFFIN A LINE', 'MUFA-D', 'Linkage - Check for wear and broken links.'],
['MEMPHIS', '05', 'BREADING LINE 1', 'BRD1-IS', 'Gear Box oil level'],
['MEMPHIS', '05', 'BREADING LINE 1', 'BRD1-IS', 'Bearings visual inspection'],
['MEMPHIS', '05', 'BREADING LINE 1', 'BRD1-IS', 'Electrical Plug condition'],
['CHICAGO', '02', 'JBC LINE 2', 'JBC-BAK-B', 'Plate separator shaft']
];
function grab3($occ)
{
return $occ[3];
}
print_r(array_count_values(array_map('grab3', $in)));
And the result is an array where the values are now the key of an array and the value is the count
Array
(
[MUFA-D] => 2
[BRD1-IS] => 3
[JBC-BAK-B] => 1
)

Answer 2

You can just loop over the array and use the indexes value as a key in an associative array to count. Then $result will contain your desired results.
$data = [
['CHICAGO', '14', 'MUFFIN A LINE', 'MUFA-D', 'Arm Bearings - Check for play, lubricate if needed.',],
['CHICAGO', '14', 'MUFFIN A LINE', 'MUFA-D', 'Linkage - Check for wear and broken links.',],
['MEMPHIS', '05', 'BREADING LINE 1', 'BRD1 - IS', 'Gear Box oil level',],
['MEMPHIS', '05', 'BREADING LINE 1', 'BRD1 - IS', 'Bearings visual inspection',],
['MEMPHIS', '05', 'BREADING LINE 1', 'BRD1 - IS', 'Electrical Plug condition',],
['CHICAGO', '02', 'JBC LINE 2', 'JBC - BAK - B', 'Plate separator shaft',],
];
$result = [];
foreach ($data as $item) {
$index = $item[3];
$result[$index] = isset($result[$index]) ? $result[$index] + 1 : 1;
}
print_r($result);
Will print
Array
(
[MUFA-D] => 3
[BRD1 - IS] => 4
[JBC - BAK - B] => 2
)

Answer 3

You could use this function on your condition.
function countSimilarValuesByIndex(array $MyArray,int $Index){
$SimilarValues = [];
foreach($MyArray as $Object){
$SimilarValues[$Object[$Index]] = (isset($SimilarValues[$Object[$Index]]))? ++$SimilarValues[$Object[$Index]]:1;
}
return $SimilarValues;
}
$MyArray = [
['CHICAGO', 14, 'MUFFIN A LINE', 'MUFA-D', 'Arm Bearings - Check for play, lubricate if needed.'],
['CHICAGO', 14, 'MUFFIN A LINE', 'MUFA-D', 'Linkage - Check for wear and broken links.'],
['MEMPHIS', 05, 'BREADING LINE 1', 'BRD1-IS', 'Gear Box oil level'],
['MEMPHIS', 05, 'BREADING LINE 1', 'BRD1-IS', 'Bearings visual inspection'],
['MEMPHIS', 05, 'BREADING LINE 1', 'BRD1-IS', 'Electrical Plug condition'],
['CHICAGO', 02, 'JBC LINE 2', 'JBC-BAK-B', 'Plate separator shaft']
];
$Index = 1;
$YourResult = countSimilarValuesByIndex($MyArray,$Index);
Result:
[
[14] => 2,
[5] => 3,
[2] => 1
]