1 <?php
  2 
  3 namespace Psr\Log;
  4 
  5 /**
  6  * Describes a logger instance
  7  *
  8  * The message MUST be a string or object implementing __toString().
  9  *
 10  * The message MAY contain placeholders in the form: {foo} where foo
 11  * will be replaced by the context data in key "foo".
 12  *
 13  * The context array can contain arbitrary data, the only assumption that
 14  * can be made by implementors is that if an Exception instance is given
 15  * to produce a stack trace, it MUST be in a key named "exception".
 16  *
 17  * See https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
 18  * for the full interface specification.
 19  */
 20 interface LoggerInterface
 21 {
 22     /**
 23      * System is unusable.
 24      *
 25      * @param string $message
 26      * @param array $context
 27      * @return null
 28      */
 29     public function emergency($message, array $context = array());
 30 
 31     /**
 32      * Action must be taken immediately.
 33      *
 34      * Example: Entire website down, database unavailable, etc. This should
 35      * trigger the SMS alerts and wake you up.
 36      *
 37      * @param string $message
 38      * @param array $context
 39      * @return null
 40      */
 41     public function alert($message, array $context = array());
 42 
 43     /**
 44      * Critical conditions.
 45      *
 46      * Example: Application component unavailable, unexpected exception.
 47      *
 48      * @param string $message
 49      * @param array $context
 50      * @return null
 51      */
 52     public function critical($message, array $context = array());
 53 
 54     /**
 55      * Runtime errors that do not require immediate action but should typically
 56      * be logged and monitored.
 57      *
 58      * @param string $message
 59      * @param array $context
 60      * @return null
 61      */
 62     public function error($message, array $context = array());
 63 
 64     /**
 65      * Exceptional occurrences that are not errors.
 66      *
 67      * Example: Use of deprecated APIs, poor use of an API, undesirable things
 68      * that are not necessarily wrong.
 69      *
 70      * @param string $message
 71      * @param array $context
 72      * @return null
 73      */
 74     public function warning($message, array $context = array());
 75 
 76     /**
 77      * Normal but significant events.
 78      *
 79      * @param string $message
 80      * @param array $context
 81      * @return null
 82      */
 83     public function notice($message, array $context = array());
 84 
 85     /**
 86      * Interesting events.
 87      *
 88      * Example: User logs in, SQL logs.
 89      *
 90      * @param string $message
 91      * @param array $context
 92      * @return null
 93      */
 94     public function info($message, array $context = array());
 95 
 96     /**
 97      * Detailed debug information.
 98      *
 99      * @param string $message
100      * @param array $context
101      * @return null
102      */
103     public function debug($message, array $context = array());
104 
105     /**
106      * Logs with an arbitrary level.
107      *
108      * @param mixed $level
109      * @param string $message
110      * @param array $context
111      * @return null
112      */
113     public function log($level, $message, array $context = array());
114 }
115