Array vertical slice. Is there any built-in function? what should I do?

Array vertical slice. Is there any built-in function? an array with many keys, key1, & nbsp; key2, & nbsp ;... I want to generate a new array based on a key & nbsp; which is to extract all values of a specific key to form an array. is there any built-in function in PHP? This is very common. & nbsp; I think there should be a built-in method. & nbsp; it is for the array vertical slice. Is there any built-in function?
An array with many keys, key1, key2 ,...
I want to generate a new array based on a key, which is to extract all values of a specific key to form an array.
Is there any built-in function in PHP?
This is very common. I think there should be a built-in method.
Is a vertical slice for the array key.

Is to implement the following functions

If (count ($ arr)> 0 ){
Foreach ($ arr as $ v ){
Array_push ($ newArr, $ v ['key1']);
}
}

Is there any built-in method?

------ Solution --------------------
Obviously, you are referring to a two-dimensional array.
Php arrays are nested and not traditional arrays. So it's impossible to predict your operation and built-in functions
Solve this problem only by traversing it by yourself

Generally, the source of the array is database query.
The required array has been constructed when reading the query data, so there is no need to transpose the array.
------ Solution --------------------
Just a few lines of code are not complicated.