(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.9.0)
PDOStatement::fetchColumn — Returns a single column from the next row of a result set
Returns a single column from the next row of a result set or FALSE if
there are no more rows.
Nota:
PDOStatement::fetchColumn() should not be used to retrieve boolean columns, as it is impossible to distinguish a value of
FALSEfrom there being no more rows to retrieve. Use PDOStatement::fetch() instead.
column_number0-indexed number of the column you wish to retrieve from the row. If no value is supplied, PDOStatement::fetchColumn() fetches the first column.
PDOStatement::fetchColumn() returns a single column
from the next row of a result set or FALSE if there are no more rows.
There is no way to return another column from the same row if you use PDOStatement::fetchColumn() to retrieve data.
Exemplo #1 Return first column of the next row
<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();
print("Fetch the first column from the first row in the result set:\n");
$result = $sth->fetchColumn();
print("name = $result\n");
print("Fetch the second column from the second row in the result set:\n");
$result = $sth->fetchColumn(1);
print("colour = $result\n");
?>
O exemplo acima irá imprimir:
Fetch the first column from the first row in the result set: name = lemon Fetch the second column from the second row in the result set: colour = red