<?This code would result in the following data:
$data = array(0, 1, 2, 'three', 4, 5, 'six', 7, 8, 'nine', 10);
$mod1 = preg_grep("/4|5|6/", $data);
$mod2 = preg_grep("/[0-9]/", $data, PREG_GREP_INVERT);
print_r($mod1);
echo "<br>";
print_r($mod2);
?>
Array ( [4] => 4 [5] => 5 )
Array ( [3] => three [6] => six [9] => nine )
First we assign our $data variable. This is a list of numbers, some in alpha form, others in numeric. The first thing we run is called $mod1. Here we are searching for anything that contains 4, 5, or 6. When our result is printed below we only get 4 and 5, because 6 was written as 'six' so it did not match our search.
Next we run $mod2, which is searching for anything that contains a numeric character. But this time we include PREG_GREP_INVERT. This will invert our data, so instead of outputting numbers, it outputs all of our entries that where not numeric (three, six and nine).
