The optional limit parameter produces the following error messages when given to the functios explode() and split():

Warning: Wrong parameter count for explode() in path/to/file.php on line xxx

Warning: unexpected regex error (13) in 
path/to/file.php on line xxx

The PHP code I executed was

list ($t1, $t2, $t3) = explode ($find, $string, 3);
list ($t1, $t2, $t3) = split ($find, $string, 3);