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Simple PHP logger utility class : http://proccli.com/logging-php
<?php
/**
* Very simple error logger
* Set error level using bitwise OR
*
* Example Usage:
*
* SimpleLogger::log_level(SimpleLogger::All);
* SimpleLogger::log_method(function($message, $level = 0)
* {
* printf("[LOG:%d] %s\n", $level, $message);
* });
*
*
*/
class SimpleLogger
{
const Debug = 1;
const Info = 2;
const Error = 4;
const All = 7;
const None = 0;
static private $_log_level = self::All;
static private $_log_method;
/**
* Sets the log level
* Example:
* SimpleLogger::log_level(SimpleLogger::Error | SimpleLogger::Info);
* @param integer $level the log level
*/
static public
function log_level($level = self::All)
{
self::$_log_level = (int)$level;
}
/**
* Sets the log method/callback
* @param mixed $callback if an array/string is given we use call_user_func_array, otherwise we call __invoke() on the object
* so we support closures in PHP >= 5.3.0
*
*/
static public
function log_method($callback)
{
self::$_log_method = $callback;
}
/**
* Log debug messages
* @param string $message
*/
static public
function debug($message)
{
self::log($message, self::Debug);
}
/**
* Log info messages
* @param string $message
*/
static public
function info($message)
{
self::log($message, self::Info);
}
/**
* Log error messages
* @param string $message
*/
static public
function error($message)
{
self::log($message, self::Error);
}
/**
* Generic log wrapper, specify a level
* @param string $message
* @param integer $level the log level
*/
static public
function log($message, $level = self::All)
{
if((self::$_log_level & $level) && self::$_log_method && is_callable(self::$_log_method))
{
if(is_object(self::$_log_method))
self::$_log_method->__invoke($message, $level);
else
call_user_func_array(self::$_log_method, array($message, $level));
}
}
}
?>
<?php
require 'simple_logger.php';
SimpleLogger::log_level(SimpleLogger::All);
SimpleLogger::log_method(function($message, $level = 0)
{
echo $message;
});
// capture the log messages
function capture_output($callback)
{
ob_start();
$callback();
$data = ob_get_contents();
ob_end_clean();
return $data;
}
// send the log messages
function send_messages()
{
$data = capture_output(function()
{
SimpleLogger::info('Info');
SimpleLogger::debug('Debug');
SimpleLogger::error('Error');
});
return $data;
}
// test info logs
SimpleLogger::log_level(SimpleLogger::Info);
$data = send_messages();
assert($data == 'Info');
// test debug
SimpleLogger::log_level(SimpleLogger::Debug);
$data = send_messages();
assert($data == 'Debug');
// test error
SimpleLogger::log_level(SimpleLogger::Error);
$data = send_messages();
assert($data == 'Error');
// test combining
SimpleLogger::log_level(SimpleLogger::Info | SimpleLogger::Error);
$data = send_messages();
assert($data == 'InfoError');
// test all
SimpleLogger::log_level(SimpleLogger::All);
$data = send_messages();
assert($data == 'InfoDebugError');
// test none
SimpleLogger::log_level(SimpleLogger::None);
$data = send_messages();
assert($data == '');
// test no method
SimpleLogger::log_level(SimpleLogger::All);
SimpleLogger::log_method(null);
$data = send_messages();
assert($data == '');
?>
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