How Can I Efficiently Convert a Comma-Delimited String to an Integer Array in PHP?

Type Conversion: Converting Comma-Delimited Strings to Integer Arrays

Converting comma-delimited strings to arrays of integers is a common programming task. Consider the following code:

$string = "1,2,3";
$ids = explode(',', $string);
var_dump($ids);

This code returns an array containing strings:

array(3) {
  [0] => string(1) "1"
  [1] => string(1) "2"
  [2] => string(1) "3"
}

However, we may need the values to be of type int rather than string. Instead of using a foreach loop to convert each string to an integer, there is a more efficient approach.

Efficient Type Conversion using array_map()

The array_map() function allows us to apply a callback function to each element of an array. In this case, we can use the intval() function to convert each string to an integer.

$integerIDs = array_map('intval', explode(',', $string));

This code generates an array containing integers:

array(3) {
  [0] => int(1)
  [1] => int(2)
  [2] => int(3)
}

By utilizing array_map(), we can achieve type conversion efficiently without the need for explicit looping.

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