How can one efficiently handle text manipulation tasks in PHP, such as splitting sentences or removing whitespace?

Text manipulation tasks in PHP, such as splitting sentences or removing whitespace, can be efficiently handled using built-in string functions. For splitting sentences, you can use the `explode()` function to split a string into an array based on a delimiter like a period. To remove whitespace, you can use functions like `trim()` to remove leading and trailing whitespace, and `preg_replace()` with a regular expression to remove all whitespace.

// Split a sentence into an array of words
$sentence = "Hello, world!";
$words = explode(" ", $sentence);
print_r($words);

// Remove whitespace from a string
$text = "   Remove   whitespace   ";
$trimmed_text = trim($text);
echo $trimmed_text;

// Remove all whitespace from a string
$text = "Remove all whitespace";
$no_whitespace_text = preg_replace('/\s+/', '', $text);
echo $no_whitespace_text;