Merging Multi-dimensional Array (Custom) PHP - Laravel

Question

Merge a multi-dimensional array to the custom array as required. Need the solution in PHP (using in Laravel-8). Custom array is needed to make rows for creating an excel file using Spreadsheet. This is the Original array I have =

array:3 [
  0 => array:4 [
    0 => array:3 [
      0 => "Name"
      1 => "English"
      2 => "Math"
    ]
    1 => array:3 [
      0 => "John"
      1 => 10
      2 => 20
    ]
    2 => array:3 [
      0 => "Doe"
      1 => 20
      2 => 30
    ]
    3 => array:3 [
      0 => "Smith"
      1 => 30
      2 => 50
    ]
  ]
  1 => array:4 [
    0 => array:3 [
      0 => "Name"
      1 => "Science"
      2 => "Hindi"
    ]
    1 => array:3 [
      0 => "John"
      1 => 10
      2 => 20
    ]
    2 => array:3 [
      0 => "Doe"
      1 => 20
      2 => 57
    ]
    3 => array:3 [
      0 => "Smith"
      1 => 30
      2 => 89
    ]
  ]
  2 => array:4 [
    0 => array:3 [
      0 => "Name"
      1 => "ABC"
      2 => "XYZ"
    ]
    1 => array:3 [
      0 => "John"
      1 => 10
      2 => 20
    ]
    2 => array:3 [
      0 => "Doe"
      1 => 20
      2 => 23
    ]
    3 => array:3 [
      0 => "Smith"
      1 => 30
      2 => 89
    ]
  ]
]

From the above array need to make the array like below (array size may very, so need dynamic solutions) -

array:1 [
  0 => array:4 [
    0 => array:7 [
      0 => "Name"
      1 => "English"
      2 => "Math"
      3 => "Science"
      4 => "Hindi"
      5 => "ABC"
      6 => "XYZ"
    ]
    1 => array:7 [
      0 => "John"
      1 => 10
      2 => 20
      3 => 10
      4 => 20
      5 => 10
      6 => 20
    ]
    2 => array:7 [
      0 => "Doe"
      1 => 20
      2 => 30
      3 => 20
      4 => 57
      5 => 20
      6 => 23
    ]
    3 => array:7 [
      0 => "Smith"
      1 => 30
      2 => 50
      3 => 30
      4 => 89
      5 => 30
      6 => 89
    ]
  ]
]