php merge sorted arrays with 0(1) code example

Example: Write a function that takes in two sorted arrays and returns a new array with all elements sorted not using array method sort.

// const newSortArrays = (arr1, arr2) => {
//     let output = [];
//     while (arr1.length && arr2.length) {
//        if (arr1[0] < arr2[0]) 
//         output.push(arr1[0] < arr2[0] ? arr1.shift() : arr2.shift())
//     }
//     return [...output, ...arr1, ...arr2]
// }