How can I achieve a new array with columns from another array's rows? [php]

Question

I have this kind of array:

2020-01; Starter1; 11,4%
2020-01; Starter2; 6,9%
2020-01; Starter3; 9,5%
2020-01; Starter4; 11,1%
2020-02; Starter1; 5,8%
2020-02;