PDOStatement::columnCount --
Returns the number of columns in the result set
Syntax
int PDOStatement::columnCount ( void )
Warning
This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Use PDOStatement::columnCount() to return the number
of columns in the result set represented by the PDOStatement object.
If the PDOStatement object was returned from PDO::query(),
the column count is immediately available.
If the PDOStatement object was returned from
PDO::prepare(), an accurate column count will not be
available until you invoke PDOStatement::execute().
Return Values
Returns the number of columns in the result set represented by the
PDOStatement object. If there is no result set,
PDOStatement::columnCount() returns 0.
Examples
Example 1. Counting columns
This example demonstrates how PDOStatement::columnCount()
operates with and without a result set.
<?php $dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
/* Count the number of columns in the (non-existent) result set */ $colcount = $sth->columnCount(); print("Before execute(), result set has $colcount columns (should be 0)\n");
$sth->execute();
/* Count the number of columns in the result set */ $colcount = $sth->columnCount(); print("After execute(), result set has $colcount columns (should be 2)\n");
?>
The above example will output:
Before execute(), result set has 0 columns (should be 0)
After execute(), result set has 2 columns (should be 2)
See Also
PDO::prepare()
PDOStatement::execute()
PDOStatement::rowCount()
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