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# PEAR_Config::definedBy()

PEAR_Config::definedBy() -- Tells what config layer that gets to define a key

## Synopsis

    require_once 'PEAR/config.php';

``string PEAR_Config::definedBy` (string $key)`

## Description

Tells what config layer that gets to define a key.

## Parameter

string `$key`

  config key

## Return value

`string` - the config layer, or an empty string if not found

## Note

This function can not be called statically.

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