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

Converting Comma-Delimited Strings to Integer Arrays

Problem: Converting a string of comma-separated numbers into an array of integers can be cumbersome, especially if you need to loop through the array and cast each string to an integer. Is there a more efficient way to approach this task?

Solution:

To directly convert a comma-delimited string into an array of integers, consider utilizing the array_map() function in conjunction with explode(). Here's how:

$string = "1,2,3";
$integerIDs = array_map('intval', explode(',', $string));

In this code, explode() is used to separate the string into an array of strings at the comma delimiters. The array_map() function then applies the intval() function to each element of the array, converting each string to an integer. The result is an array of integers:

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

This approach is not only concise but also efficient, eliminating the need for additional loops or manual casting.

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