Following the previous article [Micro-e-commerce website developed by WeChat] one of the technical notes , yesterday we implemented the log processing function.
For today’s applications, the importance of logs is self-evident. It's hard to imagine an application running in a production environment without any logging capabilities. The functions that logs can provide are diverse, including recording error information, status information, debugging information and execution time information generated when the program is running. In a production environment, logs are an important basis for finding the source of problems. Various information generated when the application is running should be recorded through the log library .
Without further ado, here is the source code of the log library:
<span 1</span> <span /*</span><span *
</span><span 2</span> <span * 日志处理类
</span><span 3</span> <span *
</span><span 4</span> <span * @since alpha 0.0.1
</span><span 5</span> <span * @date 2014.03.04
</span><span 6</span> <span * @author genialx
</span><span 7</span> <span *
</span><span 8</span> <span */</span>
<span 9</span>
<span 10</span> <span class</span> <span Log</span><span {
</span><span 11</span>
<span 12</span> <span //</span><span 单例模式</span>
<span 13</span> <span private</span> <span static</span> <span $instance</span> = <span NULL</span><span ;
</span><span 14</span> <span //</span><span 文件句柄</span>
<span 15</span> <span private</span> <span static</span> <span $handle</span> = <span NULL</span><span ;
</span><span 16</span> <span //</span><span 日志开关</span>
<span 17</span> <span private</span> <span $log_switch</span> = <span NULL</span><span ;
</span><span 18</span> <span //</span><span 日志相对目录</span>
<span 19</span> <span private</span> <span $log_file_path</span> = <span NULL</span><span ;
</span><span 20</span> <span //</span><span 日志文件最大长度，超出长度重新建立文件</span>
<span 21</span> <span private</span> <span $log_max_len</span> = <span NULL</span><span ;
</span><span 22</span> <span //</span><span 日志文件前缀,入 log_0</span>
<span 23</span> <span private</span> <span $log_file_pre</span> = 'log_'<span ;
</span><span 24</span>
<span 25</span>
<span 26</span> <span /*</span><span *
</span><span 27</span> <span * 构造函数
</span><span 28</span> <span *
</span><span 29</span> <span * @since alpha 0.0.1
</span><span 30</span> <span * @date 2014.02.04
</span><span 31</span> <span * @author genialx
</span><span 32</span> <span */</span>
<span 33</span> <span protected</span> <span function</span> __construct(){<span //</span><span 注意：以下是配置文件中的常量，请读者自行更改</span>
<span 34</span>
<span 35</span> <span $this</span>->log_file_path =<span LOG_FILE_PATH;
</span><span 36</span>
<span 37</span> <span $this</span>->log_switch =<span LOG_SWITCH;
</span><span 38</span>
<span 39</span> <span $this</span>->log_max_len =<span LOG_MAX_LEN;
</span><span 40</span>
<span 41</span> <span }
</span><span 42</span>
<span 43</span> <span /*</span><span *
</span><span 44</span> <span * 单利模式
</span><span 45</span> <span *
</span><span 46</span> <span * @since alpha 0.0.1
</span><span 47</span> <span * @date 2014.02.04
</span><span 48</span> <span * @author genialx
</span><span 49</span> <span */</span>
<span 50</span> <span public</span> <span static</span> <span function</span><span get_instance(){
</span><span 51</span> <span if</span>(!self::<span $instance</span><span instanceof self){
</span><span 52</span> self::<span $instance</span> = <span new</span><span self;
</span><span 53</span> <span }
</span><span 54</span> <span return</span> self::<span $instance</span><span ;
</span><span 55</span> <span }
</span><span 56</span>
<span 57</span> <span /*</span><span *
</span><span 58</span> <span *
</span><span 59</span> <span * 日志记录
</span><span 60</span> <span *
</span><span 61</span> <span * @param int $type 0 -> 记录(THING LOG) / 1 -> 错误(ERROR LOG)
</span><span 62</span> <span * @param string $desc
</span><span 63</span> <span * @param string $time
</span><span 64</span> <span *
</span><span 65</span> <span * @since alpha 0.0.1
</span><span 66</span> <span * @date 2014.02.04
</span><span 67</span> <span * @author genialx
</span><span 68</span> <span *
</span><span 69</span> <span */</span>
<span 70</span> <span public</span> <span function</span> <span log</span>(<span $type</span>,<span $desc</span>,<span $time</span><span ){
</span><span 71</span> <span if</span>(<span $this</span>-><span log_switch){
</span><span 72</span>
<span 73</span> <span if</span>(self::<span $handle</span> == <span NULL</span><span ){
</span><span 74</span> <span $filename</span> = <span $this</span>->log_file_pre . <span $this</span>-><span get_max_log_file_suf();
</span><span 75</span> self::<span $handle</span> = <span fopen</span>(<span $this</span>->log_file_path . <span $filename</span>, 'a'<span );
</span><span 76</span> <span }
</span><span 77</span> <span switch</span>(<span $type</span><span ){
</span><span 78</span> <span case</span> 0:
<span 79</span> <span fwrite</span>(self::<span $handle</span>, 'THING LOG:' . ' ' . <span $desc</span> . ' ' . <span $time</span> . <span chr</span>(13<span ));
</span><span 80</span> <span break</span><span ;
</span><span 81</span> <span case</span> 1:
<span 82</span> <span fwrite</span>(self::<span $handle</span>, 'ERROR LOG:' . ' ' . <span $desc</span> . ' ' . <span $time</span> . <span chr</span>(13<span ));
</span><span 83</span> <span break</span><span ;
</span><span 84</span> <span default</span>:
<span 85</span> <span fwrite</span>(self::<span $handle</span>, 'THING LOG:' . ' ' . <span $desc</span> . ' ' . <span $time</span> . <span chr</span>(13<span ));
</span><span 86</span> <span break</span><span ;
</span><span 87</span> <span }
</span><span 88</span>
<span 89</span> <span }
</span><span 90</span> <span }
</span><span 91</span>
<span 92</span> <span /*</span><span *
</span><span 93</span> <span * 获取当前日志的最新文档的后缀
</span><span 94</span> <span *
</span><span 95</span> <span * @since alpha 0.0.1
</span><span 96</span> <span * @date 2014.02.04
</span><span 97</span> <span * @author genialx
</span><span 98</span> <span */</span>
<span 99</span> <span private</span> <span function</span><span get_max_log_file_suf(){
</span><span 100</span> <span $log_file_suf</span> = <span null</span><span ;
</span><span 101</span> <span if</span>(<span is_dir</span>(<span $this</span>-><span log_file_path)){
</span><span 102</span> <span if</span>(<span $dh</span> = <span opendir</span>(<span $this</span>-><span log_file_path)){
</span><span 103</span> <span while</span>((<span $file</span> = <span readdir</span>(<span $dh</span>)) != <span FALSE</span><span ){
</span><span 104</span> <span if</span>(<span $file</span> != '.' && <span $file</span> != '..'<span ){
</span><span 105</span> <span if</span>(<span filetype</span>( <span $this</span>->log_file_path . <span $file</span>) == 'file'<span ){
</span><span 106</span> <span $rs</span> = <span split</span>('_', <span $file</span><span );
</span><span 107</span> <span if</span>(<span $log_file_suf</span> < <span $rs</span>[1<span ]){
</span><span 108</span> <span $log_file_suf</span> = <span $rs</span>[1<span ];
</span><span 109</span> <span }
</span><span 110</span> <span }
</span><span 111</span> <span }
</span><span 112</span> <span }
</span><span 113</span>
<span 114</span> <span if</span>(<span $log_file_suf</span> == <span NULL</span><span ){
</span><span 115</span> <span $log_file_suf</span> = 0<span ;
</span><span 116</span> <span }
</span><span 117</span> <span //</span><span 截断文件</span>
<span 118</span> <span if</span>( <span file_exists</span>(<span $this</span>->log_file_path . <span $this</span>->log_file_pre . <span $log_file_suf</span>) && <span filesize</span>(<span $this</span>->log_file_path . <span $this</span>->log_file_pre . <span $log_file_suf</span>) >= <span $this</span>-><span log_max_len){
</span><span 119</span> <span $log_file_suf</span> = <span intval</span>(<span $log_file_suf</span>) + 1<span ;
</span><span 120</span> <span }
</span><span 121</span>
<span 122</span> <span return</span> <span $log_file_suf</span><span ;
</span><span 123</span> <span }
</span><span 124</span> <span }
</span><span 125</span>
<span 126</span> <span return</span> 0<span ;
</span><span 127</span>
<span 128</span> <span }
</span><span 129</span>
<span 130</span> <span /*</span><span *
</span><span 131</span> <span * 关闭文件句柄
</span><span 132</span> <span *
</span><span 133</span> <span * @since alpha 0.0.1
</span><span 134</span> <span * @date 2014.02.04
</span><span 135</span> <span * @author genialx
</span><span 136</span> <span */</span>
<span 137</span> <span public</span> <span function</span><span close(){
</span><span 138</span> <span fclose</span>(self::<span $handle</span><span );
</span><span 139</span> <span }
</span><span 140</span> }
Function description:
This log class uses the singleton mode to save resources. Determine the file size by yourself. If the size exceeds the specified size, create files in sequence. For example: the file log_0 is larger than the specified size, then the log_1 file is re-created (note: the created file is based on the number of the file name suffix, please do not change the log file name at will).
To be optimized: does not specify the maximum number of files, so excessive log files must be manually deleted regularly.
Call example:
<span 1</span> <span //</span><span LOG</span>
<span 2</span> <span $L</span> = <span Log</span>::<span get_instance();
</span><span 3</span> <span //</span><span 第一个参数 int 0代表事件记录（THING LOG:)，1代表错误记录（ERROR LOG:）
</span><span 4</span> <span //第二个参数 string 描述文字
</span><span 5</span> <span //第三个参数 string 时间</span>
<span 6</span> <span $L</span>-><span log</span>(1,'日志描述', <span date</span>('Y-n-j H:m:s'<span ));
</span><span 7</span> <span $L</span>->close();
Thank you for checking it out!
Article source: http://www.ihuxu.com/p/223.html
WeChat public account (share valuable Internet information every day): Hu Xu’s personal blog
Sina Weibo: @ the Internet around me
Programming discussion group: 235173087
QQ：2252065614
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
