[PHP-NOTES] note 130353 added to function.pg-field-is-null

I'd like to emphasize another way to approach this function.

To check if the return query is null:

Let's say that the table contains a field called 'data'.

if ($ret) {
    if (pg_field_is_null($ret, 'data') == 0) {
        echo "Nothing returned\n";
        <insert code>
    }
}
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Manual Page -- https://php.net/manual/en/function.pg-field-is-null.php
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