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Splitting

preg_split($s1,$s2[,$i1=-1,[$i2]])  splits $s2 into an array of strings, using the regular expression $s1 as the separator. If $i1 is specified, up to $i1 substrings are returned, with the rest of the string being placed in the last substring. $i1=-1,0 or NULL means no limit. If $i2 is set to PREG_SPLIT_NO_EMPTY, only non-empty pieces will be returned. If $2 is set to PREG_SPLIT_DELIM_CAPTURE, parenthesized expression in the pattern will be captured as well. If $i2 is set to PREG_SPLIT_ OFFSET_CAPTURE, the string offset too will be returned for each element. 

<!DOCTYPE html><html><head></head>
<body><?php
$s = 'XXabYYacadZZ';
print_r(preg_split('/a./',$s)); 
echo "<br />";
print_r(preg_split('/a./',$s,2)); 
echo "<br />";
print_r(preg_split('/a./',$s,0,PREG_SPLIT_NO_EMPTY)); 
echo "<br />";
print_r(preg_split('/a.(..)/',$s,0, PREG_SPLIT_DELIM_CAPTURE)); 
echo "<br />";
print_r(preg_split('/a./',$s,0, PREG_SPLIT_OFFSET_CAPTURE)); 
echo "<br />";

?> </body></html>

Array ( [0] => XX [1] => YY [2] => [3] => ZZ ) 
Array ( [0] => XX [1] => YYacadZZ ) 
Array ( [0] => XX [1] => YY [2] => ZZ ) 
Array ( [0] => XX [1] => YY [2] => [3] => ad [4] => ZZ ) 
Array ( [0] => Array ( [0] => XX [1] => 0 )
             [1] => Array ( [0] => YY [1] => 4 )
             [2] => Array ( [0] => [1] => 8 )
             [3] => Array ( [0] => ZZ [1] => 10 ) )