How to Efficiently Split a String into a Multidimensional Array in PHP Without Loops?

String Manipulation: Efficiently Splitting a String into a Multidimensional Array

Splitting a string into a multidimensional array is a common task in programming. Traditional approaches often rely on iterative loops to achieve this. However, PHP offers an efficient loopless solution.

For strings like "A,5|B,3|C,8," the task is to transform them into a multidimensional array such as:

[
    ['A', 5],
    ['B', 3],
    ['C', 8],
]

The solution involves combining the power of explode() and array_map(). Here's how it works:

<code class="php"><?php
$str = "A,5|B,3|C,8";

// Split the string into individual parts based on the pipe symbol
$parts = explode('|', $str);

// Use array_map() to transform each part into an array
$a = array_map(
    function ($substr) {
        // Explode each part again to separate the values
        return explode(',', $substr);
    },
    $parts
);

By combining array_map() and explode(), the loop over the individual parts is encapsulated within the built-in functions, eliminating the need for explicit looping in your code.

The resulting $a array will be the desired multidimensional array, with each element representing a part of the original string split into an array of its own:

var_dump($a);

array
  0 => 
    array
      0 => string 'A' (length=1)
      1 => string '5' (length=1)
  1 => 
    array
      0 => string 'B' (length=1)
      1 => string '3' (length=1)
  2 => 
    array
      0 => string 'C' (length=1)
      1 => string '8' (length=1)</code>

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