PHP implements log processing class library_PHP tutorial-PHP Tutorial-php.cn

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> }

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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();

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