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string PDOStatement::fetchColumn ([ int $column_number = 0 ] )

<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();

/* Fetch the first column from the next row of the result set */
print("Fetch the first column from the next row of the result set:\n");
$result = $sth->fetchColumn();
print("name = $result\n");

print("Fetch the second column from the next row of the result set:\n");
$result = $sth->fetchColumn(1);
print("colour = $result\n");
?>

Fetch the first column from the next row of the result set:
name = lemon
Fetch the second column from the next row of the result set:
colour = red