Last updated December 20, 2010. Created by jayhariani on December 20, 2010.
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I needed to create a field that would contain a unique serial number for certain node types. Using Computed Field, this was pretty easy. But, the twist was that the serial number would need to contain a check digit. To avoid ever re-generating the serial number and overwriting an existing value, I check to see if the field is not-empty.
if (!empty($node_field[0]['value'])) { // The PIN has already been generated, do nothing
return $node_field[0]['value'];
}
else { // Time to create a PIN. Generate a random number, calculate a check digit via modulus-9, and append the check digit to the generated number
$pin = rand(1000000,2000000);
$numArray = explode(" ", $pin);
$arraySum = array_sum($numArray);
$remainder = $arraySum % 9;
$difference = 9 - $remainder;
$node_field[0]['value'] = $pin.$difference;
}