mapped diagnostic contexts. * * A Mapped Diagnostic Context, or * MDC in short, is an instrument for distinguishing interleaved log * output from different sources. Log output is typically interleaved * when a server handles multiple clients near-simultaneously. * *

The MDC is managed on a per thread basis. * * @version $Revision$ * @since 0.3 * @package log4php */ class LoggerMDC { /** * Put a context value as identified with the key parameter into the current thread's * context map. * *

If the current thread does not have a context map it is * created as a side effect.

* *

Note that you cannot put more than {@link self::HT_SIZE} keys.

* * @param string $key the key * @param string $value the value * @static */ public static function put($key, $value) { $GLOBALS['log4php.LoggerMDC.ht'][$key] = $value; } /** * Get the context identified by the key parameter. * *

You can use special key identifiers to map values in * PHP $_SERVER and $_ENV vars. Just put a 'server.' or 'env.' * followed by the var name you want to refer.

* *

This method has no side effects.

* * @param string $key * @return string * @static */ public static function get($key) { if(!empty($key)) { if(strpos($key, 'server.') === 0) { $varName = substr($key, 7); return @$_SERVER[$varName]; } else if(strpos($key, 'env.') === 0) { $varName = substr($key, 4); return @$_ENV[$varName]; } else if (isset($GLOBALS['log4php.LoggerMDC.ht'][$key])) { return $GLOBALS['log4php.LoggerMDC.ht'][$key]; } } return ''; } /** * Remove the the context identified by the key parameter. * * It only affects user mappings. * * @param string $key * @return string * @static */ public static function remove($key) { unset($GLOBALS['log4php.LoggerMDC.ht'][$key]); } }