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pg_fieldisnull
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pg_fieldisnull

Name

pg_fieldisnull — Test the NULL status of a field.

Synopsis

int pg_fieldisnull(result, row, field); int result: Result identifier int row: Row number mixed field: Field

Returns

1 if the field value is NULL; 0 if not NULL

Description

Tests whether a field contains a NULL value; returns 1 if the field is NULL or 0 if it's not. The field can be specified as a number (field offset) starting at 0, or by using the field name.

Example

Example 1034. Check for NULL

$db = pg_connect("host=dbserver dbname=db user=dbuser password=dbpasswd");
$sql = "SELECT photo FROM employees";
if (!$result = @pg_exec($sql)) {
    // error
    echo pg_errormessage($db);
} else {
    // display results
    for ($i=0;$i<pg_numrows($result);$i++) {
        if (pg_fieldisnull($result,$i,0)) {
            echo "Field is NULL\n";
        } else {
            echo "Field is not NULL\n";
        }
    }
}

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.