Convert simple JAVA code to PHP (arrays)

Question

I am not familiar with PHP, and it is hard for me to understand arrays in PHP. I have some problem to resolve, and I write simple JAVA class to resolve it, but I need it in PHP. Could some one help me to covert this below code to PHP?

Java code:

public static void main(String[] args) {
 Map<Integer, List<Integer>> outputData = new HashMap<Integer,List<Integer>>();
 int[][] inputData = new int[6][2];
 inputData[0][0] = 1;
 inputData[0][1] = 22;
 inputData[1][0] = 1;
 inputData[1][1] = 33;
 inputData[2][0] = 2;
 inputData[2][1] = 44;
 inputData[3][0] = 2;
 inputData[3][1] = 55;
 inputData[4][0] = 3;
 inputData[4][1] = 66;
 inputData[5][0] = 1;
 inputData[5][1] = 77;
 // process input data
 for(int i = 0;i<=5;i++){
 if(outputData.containsKey(inputData[i][0])){
 List<Integer> list = outputData.get(inputData[i][0]);
 list.add(inputData[i][1]);
 }else{
 List<Integer> list = new ArrayList<Integer>();
 list.add(inputData[i][1]);
 outputData.put(inputData[i][0], list);
 }
 }
 System.out.println("INPUT DATA DISPLAY");
 for(int i = 0;i<=5;i++){
 System.out.println("i: "+inputData[i][0] + " = "+inputData[i][1]);
 }
 System.out.println("OUTPUT MAP");
 for(Integer i : outputData.keySet()){
 List<Integer> l = outputData.get(i);
 System.out.print("i: "+i+" = ");
 for(Integer j : l){
 System.out.print(j + " ");
 }
 System.out.println();
 }
 }

I have input table:

i: 1 = 22
i: 1 = 33
i: 2 = 44
i: 2 = 55
i: 3 = 66
i: 1 = 77

and I need it to group elements by key. This is output:

i: 1 = 22 33 77 
i: 2 = 44 55 
i: 3 = 66 

In JAVA it is working as expected, but in PHP I am not able to write it, though I read some tutorials, manuals and examples.

[EDIT]: The real issue is: I have an excel file with N rows (loading excel is implemented). Every row have 2 columns.

enter image description here

I want to group it like this:

• data from column B should be grouped by value from column A.

In this case:

• for value 1 it will be 123, 63, 3 (rows 1, 2 and 6)
• for value 2 it will be 3, 23 (rows 3 and 4)
• for value 3 it will be 55, 234 (rows 5 and 7)

• DarSta: Hard to say if it is an duplicate. I know that automatically convert is not possible. I need help to write in PHP above logic implemented in JAVA,
• DimaSan: Probably you're right, sorry.

Answer 1

The format of the input data must be changed, because in PHP the keys must be unique. I have tested this code: (it is much simpler than in JAVA) (So the input is an array of associative arrays.)

<?php
function groupByKey($input) {
 $result = array();
 foreach($input as $item) {
 foreach($item as $key => $value) {
 $result[$key][] = $value;
 }
 }
 return $result;
}
$data = array(
 array(1 => 22),
 array(1 => 33),
 array(2 => 44),
 array(2 => 55),
 array(3 => 66),
 array(1 => 77)
);
print_r($data);
echo "\n\n";
$result = groupByKey($data);
print_r($result);

Results:

Array
(
 [0] => Array
 (
 [1] => 22
 )
 [1] => Array
 (
 [1] => 33
 )
 [2] => Array
 (
 [2] => 44
 )
 [3] => Array
 (
 [2] => 55
 )
 [4] => Array
 (
 [3] => 66
 )
 [5] => Array
 (
 [1] => 77
 )
)
Array
(
 [1] => Array
 (
 [0] => 22
 [1] => 33
 [2] => 77
 )
 [2] => Array
 (
 [0] => 44
 [1] => 55
 )
 [3] => Array
 (
 [0] => 66
 )
)

• DarSta: In fact, in JAVA I parsed xls in format: 'row1, row2,..,rowN'. Every row has columns: col1, col2. Colums are not unique. I will look into your code. Thanks.