What potential issues should be considered when splitting a string in PHP, especially when it may break in the middle of a word?

When splitting a string in PHP, especially when it may break in the middle of a word, it's important to consider the possibility of cutting off a word and creating incomplete or incorrect substrings. To solve this issue, you can use the `explode()` function to split the string by a specific delimiter (such as a space or punctuation) and then concatenate the substrings until the desired length is reached.

$string = "This is a sample string that may break in the middle of a word";
$maxLength = 20;

$words = explode(" ", $string);
$newString = "";
$length = 0;

foreach ($words as $word) {
    if ($length + strlen($word) <= $maxLength) {
        $newString .= $word . " ";
        $length += strlen($word) + 1;
    } else {
        break;
    }
}

echo trim($newString);