PDOStatement->getAttribute
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PDOStatement
PHP Manual

# PDOStatement->getColumnMeta

(PHP 5 >= 5.1.0, PECL pdo >= 0.2.0)

PDOStatement->getColumnMeta — Returns metadata for a column in a result set

### Description

array PDOStatement::getColumnMeta ( int `$column` )
Warning

This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.

Retrieves the metadata for a 0-indexed column in a result set as an associative array.

Warning

Not all PDO drivers support PDOStatement::getColumnMeta().

### Parameters

`column`

  The 0-indexed column in the result set.

### Return Values

Returns an associative array containing the following values representing the metadata for a single column:

Column metadata
Name | Value
--- | ---
native_type | The PHP native type used to represent the column value.
driver:decl_type | The SQL type used to represent the column value in the database. If the column in the result set is the result of a function, this value is not returned by PDOStatement::getColumnMeta().
flags | Any flags set for this column.
name | The name of this column as returned by the database.
table | The name of this column's table as returned by the database.
len | The length of this column. Normally -1 for types other than floating point decimals.
precision | The numeric precision of this column. Normally 0 for types other than floating point decimals.
pdo_type | The type of this column as represented by the PDO::PARAM_* constants.

Returns `FALSE` if the requested column does not exist in the result set, or if no result set exists.

### Changelog

Version | Description
--- | ---
5.2.3 | table field

### Examples

Example #1 Retrieving column metadata

The following example shows the results of retrieving the metadata for a single column generated by a function (COUNT) in a PDO_SQLITE driver.

`<?php
$select = $DB->query('SELECT COUNT(*) FROM fruit');
$meta = $select->getColumnMeta(0);
var_dump($meta);
?>`

The above example will output:

    array(6) {
      ["native_type"]=>
      string(7) "integer"
      ["flags"]=>
      array(0) {
      }
      ["name"]=>
      string(8) "COUNT(*)"
      ["len"]=>
      int(-1)
      ["precision"]=>
      int(0)
      ["pdo_type"]=>
      int(2)
    }

### See Also

- PDOStatement::columnCount() - Returns the number of columns in the result set
- PDOStatement::rowCount() - Returns the number of rows affected by the last SQL statement

PDOStatement->getAttribute
PDOStatement->nextRowset
PDOStatement
PHP Manual