CodeIgniter源代码阅读（四）/system/library/Log.php
1 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
2 /**
3 * CodeIgniter
4 *
5 * An open source application development framework for PHP 5.1.6 or newer
6 *
7 * @package CodeIgniter
8 * @author ExpressionEngine Dev Team
9 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
10 * @license http://codeigniter.com/user_guide/license.html
11 * @link http://codeigniter.com
12 * @since Version 1.0
13 * @filesource
14 */
15
16 // ------------------------------------------------------------------------
17
18 /**
19 * Logging Class
20 *
21 * @package CodeIgniter
22 * @subpackage Libraries
23 * @category Logging
24 * @author ExpressionEngine Dev Team
25 * @link http://codeigniter.com/user_guide/general/errors.html
26 */
27 class CI_Log {
28
29 protected $_log_path;//日志路径
30 protected $_threshold = 1;
31 protected $_date_fmt = 'Y-m-d H:i:s';//日期格式
32 protected $_enabled = TRUE;
33 protected $_levels = array('ERROR' => '1', 'DEBUG' => '2', 'INFO' => '3', 'ALL' => '4');
34
35 /**
36 * Constructor
37 */
38 public function __construct()
39 {
40 $config =& get_config();
41 $this->_log_path = ($config['log_path'] != '') ? $config['log_path'] : APPPATH.'logs/';//日志路径 如果没有设置默认为 application/logs/
42
43 if ( ! is_dir($this->_log_path) OR ! is_really_writable($this->_log_path))//路径是否合法可写
44 {
45 $this->_enabled = FALSE;
46 }
47
48 if (is_numeric($config['log_threshold']))//记录类型
49 {
50 $this->_threshold = $config['log_threshold'];
51 }
52
53 if ($config['log_date_format'] != '')//日期格式
54 {
55 $this->_date_fmt = $config['log_date_format'];
56 }
57 }
58
59 // --------------------------------------------------------------------
60
61 /**
62 * Write Log File 写错误入日志
63 *
64 * Generally this function will be called using the global log_message() function
65 *
66 * @param string the error level
67 * @param string the error message
68 * @param bool whether the error is a native PHP error
69 * @return bool
70 */
71 public function write_log($level = 'error', $msg, $php_error = FALSE)//写日志
72 {
73 if ($this->_enabled === FALSE)
74 {
75 return FALSE;
76 }
77
78 $level = strtoupper($level);
79
80 if ( ! isset($this->_levels[$level]) OR ($this->_levels[$level] > $this->_threshold))
81 {
82 return FALSE;
83 }
84
85 $filepath = $this->_log_path.'log-'.date('Y-m-d').'.php';
86 $message = '';
87
88 if ( ! file_exists($filepath))
89 {
90 $message .= "<"."?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); ?".">\n\n";
91 }
92
93 if ( ! $fp = @fopen($filepath, FOPEN_WRITE_CREATE))
94 {
95 return FALSE;
96 }
97
98 $message .= $level.' '.(($level == 'INFO') ? ' -' : '-').' '.date($this->_date_fmt). ' --> '.$msg."\n";
99
100 flock($fp, LOCK_EX);//轻便的咨询文件锁定 LOCK_EX：要取得独占锁定（写入的程序
101 fwrite($fp, $message);
102 flock($fp, LOCK_UN);//要释放锁定（无论共享或独占）
103 fclose($fp);
104
105 @chmod($filepath, FILE_WRITE_MODE);//修改文件的权限
106 return TRUE;
107 }
108
109 }
110 // END Log Class
111
112 /* End of file Log.php */
113 /* Location: ./system/libraries/Log.php */
2 /**
3 * CodeIgniter
4 *
5 * An open source application development framework for PHP 5.1.6 or newer
6 *
7 * @package CodeIgniter
8 * @author ExpressionEngine Dev Team
9 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
10 * @license http://codeigniter.com/user_guide/license.html
11 * @link http://codeigniter.com
12 * @since Version 1.0
13 * @filesource
14 */
15
16 // ------------------------------------------------------------------------
17
18 /**
19 * Logging Class
20 *
21 * @package CodeIgniter
22 * @subpackage Libraries
23 * @category Logging
24 * @author ExpressionEngine Dev Team
25 * @link http://codeigniter.com/user_guide/general/errors.html
26 */
27 class CI_Log {
28
29 protected $_log_path;//日志路径
30 protected $_threshold = 1;
31 protected $_date_fmt = 'Y-m-d H:i:s';//日期格式
32 protected $_enabled = TRUE;
33 protected $_levels = array('ERROR' => '1', 'DEBUG' => '2', 'INFO' => '3', 'ALL' => '4');
34
35 /**
36 * Constructor
37 */
38 public function __construct()
39 {
40 $config =& get_config();
41 $this->_log_path = ($config['log_path'] != '') ? $config['log_path'] : APPPATH.'logs/';//日志路径 如果没有设置默认为 application/logs/
42
43 if ( ! is_dir($this->_log_path) OR ! is_really_writable($this->_log_path))//路径是否合法可写
44 {
45 $this->_enabled = FALSE;
46 }
47
48 if (is_numeric($config['log_threshold']))//记录类型
49 {
50 $this->_threshold = $config['log_threshold'];
51 }
52
53 if ($config['log_date_format'] != '')//日期格式
54 {
55 $this->_date_fmt = $config['log_date_format'];
56 }
57 }
58
59 // --------------------------------------------------------------------
60
61 /**
62 * Write Log File 写错误入日志
63 *
64 * Generally this function will be called using the global log_message() function
65 *
66 * @param string the error level
67 * @param string the error message
68 * @param bool whether the error is a native PHP error
69 * @return bool
70 */
71 public function write_log($level = 'error', $msg, $php_error = FALSE)//写日志
72 {
73 if ($this->_enabled === FALSE)
74 {
75 return FALSE;
76 }
77
78 $level = strtoupper($level);
79
80 if ( ! isset($this->_levels[$level]) OR ($this->_levels[$level] > $this->_threshold))
81 {
82 return FALSE;
83 }
84
85 $filepath = $this->_log_path.'log-'.date('Y-m-d').'.php';
86 $message = '';
87
88 if ( ! file_exists($filepath))
89 {
90 $message .= "<"."?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); ?".">\n\n";
91 }
92
93 if ( ! $fp = @fopen($filepath, FOPEN_WRITE_CREATE))
94 {
95 return FALSE;
96 }
97
98 $message .= $level.' '.(($level == 'INFO') ? ' -' : '-').' '.date($this->_date_fmt). ' --> '.$msg."\n";
99
100 flock($fp, LOCK_EX);//轻便的咨询文件锁定 LOCK_EX：要取得独占锁定（写入的程序
101 fwrite($fp, $message);
102 flock($fp, LOCK_UN);//要释放锁定（无论共享或独占）
103 fclose($fp);
104
105 @chmod($filepath, FILE_WRITE_MODE);//修改文件的权限
106 return TRUE;
107 }
108
109 }
110 // END Log Class
111
112 /* End of file Log.php */
113 /* Location: ./system/libraries/Log.php */
