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PHP sort array by key


PHP sort array by key

By : Pierre ARNOU
Date : November 15 2020, 06:54 AM
To fix this issue Use usort()
code :
$arr = Array(
    array('id' => 4,'username' => 'bla2'),
    array('id' => 5,'username' => 'bla3'),
    array('id' => 6,'username' => 'bla1'),
);

function custom_sort($a, $b)
{
    return strnatcmp($a['username'], $b['username']);
}

usort($arr, "custom_sort");

print '<pre>';
print_r($arr);
print '</pre>';
Array
(
[0] => Array
    (
        [id] => 4
        [username] => bla1
    )

[1] => Array
    (
        [id] => 4
        [username] => bla2
    )

[2] => Array
    (
        [id] => 4
        [username] => bla3
    )

)


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Choosing minimum length k of array for merge sort where use of insertion sort to sort the subarrays is more optimal than

Choosing minimum length k of array for merge sort where use of insertion sort to sort the subarrays is more optimal than


By : Elena Urquiola
Date : March 29 2020, 07:55 AM
like below fixes the issue Well, this is a mathematical minimization problem, and to solve it, we need some basic calculus.
We need to find the value of k for which d[n*k + n*lg(n/k)] / dk == 0.
code :
d[n*k + n*lg(n/k)] / dk = d[n*k + nlg(n) - nlg(k)] / dk
= n + 0 - n*1/k = n - n/k 
=>
n - n/k = 0 => n = n/k => 1/k = 1 => k = 1
Sort multi-dimensional array, append text and then continue to sort array by number value in javascript

Sort multi-dimensional array, append text and then continue to sort array by number value in javascript


By : perro123
Date : March 29 2020, 07:55 AM
With these it helps When you add pixel, you have strings and not numbers. So you need to parse out the number
code :
convertToArray: function(e){
   var xVal = (Math.floor(e.offsetX / s.pixSize) * s.pixSize) + "px";
   var yVal = (Math.floor(e.offsetY / s.pixSize) * s.pixSize) + "px";
   s.storeValues.push([xVal, yVal]);
   var compare = function(a, b) { return parseFloat(a[0]) - parseFloat(b[0]); };
   s.storeValues.sort(compare);
}
How to prompt user to input a number to get size of array. Then sort array using bubble sort method

How to prompt user to input a number to get size of array. Then sort array using bubble sort method


By : syam ash
Date : March 29 2020, 07:55 AM
wish helps you Haven't practiced Java in a long while so any help would be appreciated. , You could do as follows:
code :
import java.util.Arrays;
import java.util.Scanner;
import java.util.Random;
public class BubbleTest {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("Please enter a number to create array."+"\n");
        int z = scan.nextInt();
        int [] array = new int[z];
        // Randomly generating array elements

        for(int i =0; i<z; i++){
            array[i]=new Random().nextInt();
        }
      //  z = scan.nextInt();
        System.out.println("Unsorted:");
        System.out.println(Arrays.toString(array));


        //Bubble Sort
        for(int i = array.length-1; i>=0; i--)
        {
            for(int j=0; j<i; j++)
            {
                if(array[j] > array[j+1])
                {
                    int temp = array[j];
                    array[j] = array[j+1];
                    array[j+1] = temp;
                }
            }
        }

        System.out.println("sorted:");
        System.out.println(Arrays.toString(array));
    }

}
How does Return 1 or -1 works/means in array.sort (a>b) (JS)? Asking about process of the methos array.sort

How does Return 1 or -1 works/means in array.sort (a>b) (JS)? Asking about process of the methos array.sort


By : Kaitlin Hoyt
Date : March 29 2020, 07:55 AM
With these it helps First of, as discussed above the MDN Sort description is very good.
But we can simplify for here:
code :
// Number ordering is very straight forward. 
const hola = [0, 4, 10, 60, 5]
const holaSorted = hola.sort((a,b) => a-b); 
console.log(holaSorted);

// reverse the order.
const holaSorted2 = hola.sort((a,b) => b-a);
console.log(holaSorted);
const people = [
  {
    name: 'Bob',
    age: 20
  },
  {
    name: 'Anne',
    age: 50,
  },
  {
    name: 'Terry',
    age: 5
  }
];

// Order by name
const byName = people.sort((a,b) => (a.name < b.name) ? -1 : (a.name > b.name) ? 1 : 0);

console.log(byName);

// Order by age
const byAge = people.sort((a, b) => a.age-b.age);

console.log(byAge);
Force chrome to do use merge sort or quick sort for array#sort

Force chrome to do use merge sort or quick sort for array#sort


By : o_O
Date : March 29 2020, 07:55 AM
wish helps you Stable sort in Array#sort? No, you can't specify algorithm to use (and standard doesn't say anything about it). So you can either write your own sort function or extend the key:
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