This short snippet is useful if you need to extract alphanumeric sequences (characters) from a string:

function extract_alphanumeric_sequences($string)
{
preg_match_all('/([a-zA-Z0-9]+)/', $string, $match);

return $match[0];
}

$string = 'Suspendisse 354 65pretium eros ut 43564 mauris. Integer in lacus quis est dignissim posuere. Aenean dui.  &$#^@ %$ 94375  Mauris non turpis sit amet nunc imperdiet varius.';

$alpha_array = extract_alphanumeric_sequences($string);

echo '<pre>'; print_r($alpha_array); echo "</pre>";

Output:

Array
(
    [0] => Suspendisse
    [1] => 354
    [2] => 65pretium
    [3] => eros
    [4] => ut
    [5] => 43564
    [6] => mauris
    [7] => Integer
    [8] => in
    [9] => lacus
    [10] => quis
    [11] => est
    [12] => dignissim
    [13] => posuere
    [14] => Aenean
    [15] => dui
    [16] => 94375
    [17] => Mauris
    [18] => non
    [19] => turpis
    [20] => sit
    [21] => amet
    [22] => nunc
    [23] => imperdiet
    [24] => varius
)

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