PHP实现日志处理类库-php手册-php.cn

继上篇文章【微信开发之微电商网站】技术笔记之一,昨日做了日志处理的功能。

对于现在的应用程序来说，日志的重要性是不言而喻的。很难想象没有任何日志记录功能的应用程序运行在生产环境中。日志所能提供的功能是多种多样的，包括记录程序运行时产生的错误信息、状态信息、调试信息和执行时间信息等。在生产环境中，日志是查找问题来源的重要依据。应用程序运行时的产生的各种信息，都应该通过日志类库来进行记录。

废话不多说了，附上日志类库的源代码:

<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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功能说明：
该日志类利用单例模式，节省资源。自行判断文件大小，超出指定大小则按序自行创建文件。如：文件log_0大于指定大小，则重新创建log_1文件（注意：创建文件是安装文件名后缀的数字的，请勿随意更改日志文件名）。

有待优化：没有指定文件的最大个数，所以定期要手动删除过多的日志文件。

调用示例：

<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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感谢您的查阅！

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