What is the recommended method for converting a string into an array in PHP?

When converting a string into an array in PHP, the recommended method is to use the `str_split()` function. This function will split a string into an array of characters. It takes two parameters: the string to split and the length of each chunk. If the length parameter is not specified, each character will be a separate element in the array.

$string = "Hello";
$array = str_split($string);
print_r($array);