The split() function splits the string into an array using a regular expression and returns an array.
The explode() function splits the string by string.
split uses regular expressions, while explode works with delimiter characters and split is deprecated in PHP 5.3.
Ex:
split(',','Hi, and Where are you');
returns array('Hi,', 'and Where are you')
explode('and','Hi, and Where are you');
returns array('Hi,', 'Where are you')