how we add array values to another array in php : 

**below is my $array1 and $array2.
And I want to add $array2 values in the first indexes of the $array1**

$array1 = Array
(
    [0] => Array
        (
            [0] => 2
            [1] => 6
            [2] => 15 
            [3] => 6
           
        )

    [1] => Array
        (
            [0] => 5
            [1] => 8
            [2] => 6
            [3] => 12
           
        )

    [2] => Array
        (
            [0] => 2
            [1] => 5
            [2] => 5
            [3] => 5
            
        )

)

**below is $array2.
i want to pick this array values and put this values to above $array1**



$array2 = Array
(
    [0] => Outlook
    [1] => Temp
    [2] => Humidity
    
   
)


**Aspect-ed output is below where added value i show in single quotes** 

$array1 = Array
(
    [0] => Array
        (
            [0] =>  'Outlook'
	    [1] => 2
            [2] => 6
            [3] => 15 
            [4] => 6
	   
           
        )

    [1] => Array
        (
  
	    [0] =>   'Temp'
            [1] => 5
            [2] => 8
            [3] => 6
            [4] => 12
           
        )

    [2] => Array
        (
	    [0] =>  'Humidity'
            [1] => 2
            [2] => 5
            [3] => 5
            [4] => 5
            
        )

)