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> }
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();
感谢您的查阅！
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