简单的php自定义异常日志
简单的php自定义错误日志
平时经常看php的错误日志，很少有机会去自己动手写日志，看了王健的《最佳日志实践》觉得写一个清晰明了，结构分明的日志还是非常有必要的。
在写日志前，我们问问自己：为什么我们有时要记录自定义的日志呢？而不用系统默认的日志记录方式呢？
我认为有两个原因：
1.团队需要一个统一格式的日志方便管理
2.大量无用错误日志占据硬盘空间，仅需记录有意义的日志。
那么，实践一下。
1.打开你的php.ini
2.打开日志记录,将
log_errors = Off
改成
log_errors = On
3.将php.ini保存退出并重启web服务器
4.在你的代码最前面加上如下代码
<span style="color: #008080;"> 1</span> <span style="color: #000000;">php</span><span style="color: #008080;"> 2</span> <span style="color: #008080;"> 3</span> <span style="color: #008000;">//</span><span style="color: #008000;">错误处理函数</span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">function</span> myErrorHandler(<span style="color: #800080;">$errno</span>, <span style="color: #800080;">$errstr</span>, <span style="color: #800080;">$errfile</span>, <span style="color: #800080;">$errline</span><span style="color: #000000;">)</span><span style="color: #008080;"> 5</span> <span style="color: #000000;">{</span><span style="color: #008080;"> 6</span> <span style="color: #800080;">$log_file</span> = "./php_%s_log_".<span style="color: #008080;">date</span>("Ymd").".log";<span style="color: #008000;">//</span><span style="color: #008000;">定义日志文件存放目录和文件名</span><span style="color: #008080;"> 7</span> <span style="color: #800080;">$template</span> = ''<span style="color: #000000;">;</span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">switch</span> (<span style="color: #800080;">$errno</span><span style="color: #000000;">) {</span><span style="color: #008080;"> 9</span> <span style="color: #0000ff;">case</span> <span style="color: #ff00ff;">E_USER_ERROR</span>:<span style="color: #008080;">10</span> <span style="color: #800080;">$template</span> .= "用户ERROR级错误，必须修复 错误编号[<span style="color: #800080;">$errno</span>] <span style="color: #800080;">$errstr</span> "<span style="color: #000000;">;</span><span style="color: #008080;">11</span> <span style="color: #800080;">$template</span> .= "错误位置 文件<span style="color: #800080;">$errfile</span>,第 <span style="color: #800080;">$errline</span> 行\n"<span style="color: #000000;">;</span><span style="color: #008080;">12</span> <span style="color: #800080;">$log_file</span> = <span style="color: #008080;">sprintf</span>(<span style="color: #800080;">$log_file</span>,'error'<span style="color: #000000;">);</span><span style="color: #008080;">13</span> <span style="color: #0000ff;">exit</span>(1);<span style="color: #008000;">//</span><span style="color: #008000;">系统退出</span><span style="color: #008080;">14</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">15</span> <span style="color: #008080;">16</span> <span style="color: #0000ff;">case</span> <span style="color: #ff00ff;">E_USER_WARNING</span>:<span style="color: #008080;">17</span> <span style="color: #800080;">$template</span> .= "用户WARNING级错误，建议修复 错误编号[<span style="color: #800080;">$errno</span>] <span style="color: #800080;">$errstr</span> "<span style="color: #000000;">;</span><span style="color: #008080;">18</span> <span style="color: #800080;">$template</span> .= "错误位置 文件<span style="color: #800080;">$errfile</span>,第 <span style="color: #800080;">$errline</span> 行\n"<span style="color: #000000;">;</span><span style="color: #008080;">19</span> <span style="color: #800080;">$log_file</span> = <span style="color: #008080;">sprintf</span>(<span style="color: #800080;">$log_file</span>,'warning'<span style="color: #000000;">);</span><span style="color: #008080;">20</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">21</span> <span style="color: #008080;">22</span> <span style="color: #0000ff;">case</span> <span style="color: #ff00ff;">E_USER_NOTICE</span>:<span style="color: #008080;">23</span> <span style="color: #800080;">$template</span> .= "用户NOTICE级错误，不影响系统，可不修复 错误编号[<span style="color: #800080;">$errno</span>] <span style="color: #800080;">$errstr</span> "<span style="color: #000000;">;</span><span style="color: #008080;">24</span> <span style="color: #800080;">$template</span> .= "错误位置 文件<span style="color: #800080;">$errfile</span>,第 <span style="color: #800080;">$errline</span> 行\n"<span style="color: #000000;">;</span><span style="color: #008080;">25</span> <span style="color: #800080;">$log_file</span> = <span style="color: #008080;">sprintf</span>(<span style="color: #800080;">$log_file</span>,'notice'<span style="color: #000000;">);</span><span style="color: #008080;">26</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">27</span> <span style="color: #008080;">28</span> <span style="color: #0000ff;">default</span>:<span style="color: #008080;">29</span> <span style="color: #800080;">$template</span> .= "未知错误类型: 错误编号[<span style="color: #800080;">$errno</span>] <span style="color: #800080;">$errstr</span> "<span style="color: #000000;">;</span><span style="color: #008080;">30</span> <span style="color: #800080;">$template</span> .= "错误位置 文件<span style="color: #800080;">$errfile</span>,第 <span style="color: #800080;">$errline</span> 行\n"<span style="color: #000000;">;</span><span style="color: #008080;">31</span> <span style="color: #800080;">$log_file</span> = <span style="color: #008080;">sprintf</span>(<span style="color: #800080;">$log_file</span>,'unknown'<span style="color: #000000;">);</span><span style="color: #008080;">32</span> <span style="color: #0000ff;">break</span><span style="color: #000000;">;</span><span style="color: #008080;">33</span> <span style="color: #000000;"> }</span><span style="color: #008080;">34</span> <span style="color: #008080;">file_put_contents</span>(<span style="color: #800080;">$log_file</span>,<span style="color: #800080;">$template</span>,<span style="color: #000000;">FILE_APPEND);</span><span style="color: #008080;">35</span> <span style="color: #008080;">36</span> <span style="color: #0000ff;">return</span> <span style="color: #0000ff;">true</span><span style="color: #000000;">;</span><span style="color: #008080;">37</span> <span style="color: #000000;">}</span><span style="color: #008080;">38</span> <span style="color: #008080;">39</span> <span style="color: #800080;">$error_handler</span> = <span style="color: #008080;">set_error_handler</span>("myErrorHandler");<span style="color: #008000;">//</span><span style="color: #008000;">开启自定义错误日志</span>5.试着在刚才的代码后写下一段错误代码
<span style="color: #0000ff;">echo</span> 1/0;
看看你定义的路径下是否多了一个日志文件呢？:)
注：以下级别的错误不能由用户定义的函数来处理： E_ERROR、 E_PARSE、 E_CORE_ERROR、 E_CORE_WARNING、 E_COMPILE_ERROR、 E_COMPILE_WARNING，和在 调用 set_error_handler() 函数所在文件中产生的大多数 E_STRICT。
不过当你开启了错误日志系统(php.ini中的log_error = on)并且指定了系统日志文件(同样也是php.ini中的error_log=路径名),并且error_reporting开启了全部后，以上的错误都会作为系统错误日志而记录在你定义的文件中。
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