What potential issues can arise when splitting values at commas in PHP?

When splitting values at commas in PHP, potential issues can arise if the values themselves contain commas or if there are leading or trailing spaces. To solve this issue, you can use the `array_map` function with `trim` to remove any extra spaces from each value after splitting.

// Example code to split values at commas and trim extra spaces
$string = "apple, banana, orange ,grape";
$values = array_map('trim', explode(',', $string));

print_r($values);