PDOStatement::fetchColumn
Returns a single column from the next row of a result set
Description
public mixed PDOStatement::fetchColumn(int $column = 0)
Note:
PDOStatement::fetchColumn should not be used to
retrieve boolean columns, as it is impossible to distinguish a value of
false from there being no more rows to retrieve. Use
PDOStatement::fetch instead.
Parameters
-
column
-
0-indexed number of the column you wish to retrieve from the row. If
no value is supplied, PDOStatement::fetchColumn
fetches the first column.
Return Values
PDOStatement::fetchColumn returns a single column
from the next row of a result set or false if there are no more rows.
Warning
There is no way to return another column from the same row if you
use PDOStatement::fetchColumn to retrieve data.
Errors/Exceptions
Emits an error with level E_WARNING if the attribute PDO::ATTR_ERRMODE is set
to PDO::ERRMODE_WARNING.
Throws a PDOException if the attribute PDO::ATTR_ERRMODE
is set to PDO::ERRMODE_EXCEPTION.
Examples
Example #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";
?>
The above example will output:
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
See Also
- PDO::query
- PDOStatement::fetch
- PDOStatement::fetchAll
- PDO::prepare
- PDOStatement::setFetchMode