How to Efficiently Convert a Comma-Separated String of Integers into an Integer Array in PHP?

Convert a Comma-Delimited String into an Array of Integers

In a recent coding scenario, a developer was tasked with converting a string of comma-separated integers into an array of integers. The provided code:

<pre class="brush:php;toolbar:false">$string = "1,2,3"
$ids = explode(',', $string);
var_dump($ids);

resulted in an array of strings, rather than integers. To address this issue, the developer posed the following question:

Concern:
I need for the values to be of type int instead of type string. Is there a better way of doing this than looping through the array with foreach and converting each string to int?

Solution:
To achieve the desired conversion, a more efficient approach is to use the array_map() function along with explode(). The corrected code:

<pre class="brush:php;toolbar:false">$integerIDs = array_map('intval', explode(',', $string));

Now, the result of var_dump($integerIDs) will yield:

<pre class="brush:php;toolbar:false">array(3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}

This solution eliminates the need for manual looping and provides a more concise method for converting the comma-delimited string into an array of integers.

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