Sorting PHP Array

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How can I solve the following problem:

I have 4 arrays that are concatenated (array_merge) and saw only one, but now I need to concatenate the vectors in a different way.

I need to take index 1 of each array, then index 2, and so on. (Not all have the same amount of indexes) to fill a single array.

php array
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    every arrays in a minimal example? could post in your question?

  • Describing the general problem you will get only a general answer. Example: "How to build a house?" , "Use blocks and cement, build solid walls". Instead ask something specific and responsive in a useful way: "How to lift a wall using this type of block with such a slope and such height safely?" , answer: "Position the blocks in such format, run this block placement algorithm, do not use this tool because there is such a risk, here is an example running from a wall ready for you to see how it does [link]". See? Too many wide questions don’t help.

  • 1

    I understand, I particularly don’t like asking for help with codes, because people think I’m taking advantage, in this case I’d just like more heads to think of a solution.

  • You can do this with array_map()

1 answer

1


I don’t program in PHP but I made a super simple algorithm that solves the problem with javascript.

Basically it checks which is the longest array and does a go over the maximum size. At each pass by looping it checks whether each of the arrays has the current index and adds in a new array.

var a = [1,2,3,4,5];
var b = ['a','b','c'];
var c = ['aa','bb','cc','dd','ee','ff'];

var elem = document.getElementById('new_array');

var new_array = [];

var max_length = 0;

// Verifica qual o maior array    
if (a.length > b.length && a.length > c.length) {
    max_length = a.length;
} else if (b.length > a.length && b.length > c.length) {
    max_length = b.length;
} else {
    max_length = c.length;
}

// Percorre todos os arrays com base no maior deles
// Verifica se o indice atual existe e adiciona ao novo array
for (var i = 0; i < max_length; i++) {
  if (a[i]) {
    new_array.push(a[i]);
  }

  if (b[i]) {
    new_array.push(b[i]);
  }

  if (c[i]) {
    new_array.push(c[i]);
  }
}

elem.innerHTML = JSON.stringify(new_array)

Output: [1,"a","aa",2,"b","bb",3,"c","cc",4,"dd",5,"ee","ff"]

  • Leandro, thank you, that’s exactly what you quoted. I tested this in php code and it worked perfectly. At first I thought this option was unfeasible because it would burst in any of the vectors the index, but with your if before assigning fixed the problem.

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