PHP Create Sub Arrays from Master Array based on keys - php

Question

This pertains to PHP.
I have an array of arrays that is a recordset from a db query:
Array
(
[0] => Array
(
[0] => Amazon
[1] => AmazonSendTracking
[2] =>
[3] => 1
[4] => IN
[5] => 2020-01-07 11:32:18
[6] => 7
[7] => 5
)
[1] => Array
(
[0] => Amazon
[1] => AmazonGetOrdersAndMove
[2] =>
[3] => 4
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 6
[7] => 4
)
[2] => Array
(
[0] => Test
[1] => RedirectTest1
[2] => data=data1&data2=data2&testvar=testvariable
[3] => 4
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 19
[7] => 17
)
[3] => Array
(
[0] => Test
[1] => RedirectTest2
[2] => data=value&data2=value2&testvar=value3
[3] => 4
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 19
[7] => 25
)
[4] => Array
(
[0] => Amazon
[1] => AmazonPushInventory
[2] =>
[3] => 15
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 27
[7] => 26
)
[5] => Array
(
[0] => Amazon
[1] => CalculateFloorCeiling
[2] =>
[3] => 15
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 27
[7] => 27
)
[6] => Array
(
[0] => Amazon
[1] => AmazonSubmitPricingXML
[2] =>
[3] => 15
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 27
[7] => 28
)
[7] => Array
(
[0] => Amazon
[1] => AmazonSubmitPricingXMLResetBusinessAndFlipEm
[2] =>
[3] => 1440
[4] => OUT
[5] =>
[6] => 8
[7] => 6
)
)
the Value in the 7th position (6) of the sub-array represents a "group" that I want to break out into individual arrays.
So I want the above to become one array of items not in any group and then a new array for each group like this:
Array1 - All Items not in a group
Array1
(
[0] => Array
(
[0] => Amazon
[1] => AmazonSendTracking
[2] =>
[3] => 1
[4] => IN
[5] => 2020-01-07 11:32:18
[6] => 7
[7] => 5
)
[1] => Array
(
[0] => Amazon
[1] => AmazonGetOrdersAndMove
[2] =>
[3] => 4
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 6
[7] => 4
)
[2] => Array
(
[0] => Amazon
[1] => AmazonSubmitPricingXMLResetBusinessAndFlipEm
[2] =>
[3] => 1440
[4] => OUT
[5] =>
[6] => 8
[7] => 6
)
)
Array2 - 1st group
Array2(
[0] => Array
(
[0] => Test
[1] => RedirectTest1
[2] => data=data1&data2=data2&testvar=testvariable
[3] => 4
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 19
[7] => 17
)
[1] => Array
(
[0] => Test
[1] => RedirectTest2
[2] => data=value&data2=value2&testvar=value3
[3] => 4
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 19
[7] => 25
)
)
Array3 - 2nd group
Array3(
[0] => Array
(
[0] => Amazon
[1] => AmazonPushInventory
[2] =>
[3] => 15
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 27
[7] => 26
)
[1] => Array
(
[0] => Amazon
[1] => CalculateFloorCeiling
[2] =>
[3] => 15
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 27
[7] => 27
)
[2] => Array
(
[0] => Amazon
[1] => AmazonSubmitPricingXML
[2] =>
[3] => 15
[4] => ALL
[5] => 2020-01-07 11:32:18
[6] => 27
[7] => 28
)
)
Im just not sure what array functions would be best used to accomplish this. I have tried getting the count of each group using the following.
I have a loop that steps through the master array (array of arrays call $rs) and while in the loop I pull out the 7th position into a variable called $HeaderRecNbr and then do this:
$GroupCount=array_count_values(array_column($rs, 6))[$HeaderRecNbr];
but Im not sure where to go from here.

Answer 1

Just create an array indexed by the group from index 6. This will create a sub-array for each group indexed by the group number:
foreach($array as $v) {
$groups[$v[6]][] = $v;
}
Then to get the items that are alone in a group, check if there is exactly one sub-array and add it to another array. Then remove it from the group array:
foreach($groups as $k => $v) {
if(count($v) == 1) {
$other[] = $v; // or $other[$v[0][6]][] = $v;
unset($groups[$k]);
}
}

Answer 2

$mainArray = ... all rows variable here..
$groupedArray = [];
$countArray = [];
foreach ($mainArray as $k => $v) {
$groupedArray[$v[6]][] = $v;
$countArray[$v[6]]++;
}
$singleItems = [];
$multipleItems = [];
foreach ($groupedArray as $k => $v) {
if ($countArray[$k] > 1) $multipleItems[] = $v;
else $singleItems = $v;
}
... do something with single and multi - groups...
1: start by grouping all items in groups by the 6th item of sub array... keep count of them at same time
2. Separate single and multiple items groups in 2 arrays...
3. Do whatever you need with multi-items groups.

Answer 3

This function will group them by desired index, then combine the ones that dont have any other with same index, and return an array of arrays, ungrouped, then all grouped.
function sortByIndex( $data, $index ) {
$sortedData = array();
$ungroupedData = array();
// Make sure you can loop through
if ( ! is_array( $data ) ) {
return FALSE;
}
foreach ( $data as $key => $arrayToInspect ) {
if ( ! isset( $sortedData[$arrayToInspect[$index]] ) ) {
$sortedData[$arrayToInspect[$index]] = array();
}
$sortedData[$arrayToInspect[$index]][] = $arrayToInspect;
}
// Combine as desired
foreach ( $sortedData as $groupId => $data ) {
if ( count( $data ) < 2 ) {
$ungroupedData[] = $data;
unset( $sortedData[$groupId] );
}
}
return ( array_merge( [ $ungroupedData ], array_values( $sortedData ) ) );
}