php的写文件并发问题谁遇见过？

╰半橙微兮° 2022-08-13 02:29 148阅读 0赞

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# php的写文件并发问题谁遇见过？ #

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     <h2>php的写文件并发问题谁遇见过？</h2> 
     <div>
       现 在写了一个访问统计访问人数，网站的访问量每天也就几千人，结果发现统计结果有时会出问题，使用APACHE AB 高流量测试更能发现问题，确定问题是出在file_put_contents&nbsp;&nbsp;未完成就被另一个file_get_contents读取为 NULL，使用了排他型锁定仍然无法 
      <span>解决</span>问题。 
      <br> 请问该如果解决读写 
      <span>文件</span>并发问题？为什么加锁也没有用？ 
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     <h2>我看到FLEAPHP框架里有这样两个函数</h2> 
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      <div> 
       <span>复制PHP内容到剪贴板</span> 
       <h5 style="cursor: pointer;">PHP代码:</h5> 
       <code style="font-size: 12px;"><span style="color: #ff8000;">/**&nbsp;*&nbsp;safe_file_put_contents()&nbsp;一 次性完成打开文件，写入内容，关闭文件三项工作，并且确保写入时不会造成并发冲 突&nbsp;*&nbsp;*&nbsp;@param&nbsp;string&nbsp;$filename&nbsp;*&nbsp;@param&nbsp;string&nbsp;$content&nbsp;*&nbsp;@param&nbsp;int&nbsp;$flag&nbsp;*&nbsp;*&nbsp;@return&nbsp;boolean&nbsp;*/&nbsp;</span><span style="color: #007700;">function&nbsp;</span><span style="color: #0000bb;">safe_file_put_contents</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$filename</span><span style="color: #007700;">,&nbsp;&amp;&nbsp;</span><span style="color: #0000bb;">$content</span><span style="color: #007700;">)&nbsp;{&nbsp;</span><span style="color: #0000bb;">$fp&nbsp;</span><span style="color: #007700;">=&nbsp;</span><span style="color: #0000bb;">fopen</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$filename</span><span style="color: #007700;">,&nbsp;</span><span style="color: #dd0000;">'wb'</span><span style="color: #007700;">);&nbsp;if&nbsp;(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">)&nbsp;{&nbsp;</span><span style="color: #0000bb;">flock</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">,&nbsp;</span><span style="color: #0000bb;">LOCK_EX</span><span style="color: #007700;">);&nbsp;</span><span style="color: #0000bb;">fwrite</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">,&nbsp;</span><span style="color: #0000bb;">$content</span><span style="color: #007700;">);&nbsp;</span><span style="color: #0000bb;">flock</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">,&nbsp;</span><span style="color: #0000bb;">LOCK_UN</span><span style="color: #007700;">);&nbsp;</span><span style="color: #0000bb;">fclose</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">);&nbsp;return&nbsp;</span><span style="color: #0000bb;">true</span><span style="color: #007700;">;&nbsp;}&nbsp;else&nbsp;{&nbsp;return&nbsp;</span><span style="color: #0000bb;">false</span><span style="color: #007700;">;&nbsp;}&nbsp;}</span><br> <br> </code> 
      </div> 
      <div> 
       <span>复制PHP内容到剪贴板</span> 
       <h5 style="cursor: pointer;">PHP代码:</h5> 
       <code style="font-size: 12px;"><span style="color: #ff8000;">/**&nbsp;*&nbsp;safe_file_get_contents()&nbsp;用共享锁模式打开文件并读取内容，可以避免在并发写入造成的读取不完整问题&nbsp;*&nbsp;*&nbsp;@param&nbsp;string&nbsp;$filename&nbsp;*&nbsp;*&nbsp;@return&nbsp;mixed&nbsp;*/&nbsp;</span><span style="color: #007700;">function&nbsp;</span><span style="color: #0000bb;">safe_file_get_contents</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$filename</span><span style="color: #007700;">)&nbsp;{&nbsp;</span><span style="color: #0000bb;">$fp&nbsp;</span><span style="color: #007700;">=&nbsp;</span><span style="color: #0000bb;">fopen</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$filename</span><span style="color: #007700;">,&nbsp;</span><span style="color: #dd0000;">'rb'</span><span style="color: #007700;">);&nbsp;if&nbsp;(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">)&nbsp;{&nbsp;</span><span style="color: #0000bb;">flock</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">,&nbsp;</span><span style="color: #0000bb;">LOCK_SH</span><span style="color: #007700;">);&nbsp;</span><span style="color: #0000bb;">clearstatcache</span><span style="color: #007700;">();&nbsp;</span><span style="color: #0000bb;">$filesize&nbsp;</span><span style="color: #007700;">=&nbsp;</span><span style="color: #0000bb;">filesize</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$filename</span><span style="color: #007700;">);&nbsp;if&nbsp;(</span><span style="color: #0000bb;">$filesize&nbsp;</span><span style="color: #007700;">&gt;&nbsp;</span><span style="color: #0000bb;">0</span><span style="color: #007700;">)&nbsp;{&nbsp;</span><span style="color: #0000bb;">$data&nbsp;</span><span style="color: #007700;">=&nbsp;</span><span style="color: #0000bb;">fread</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">,&nbsp;</span><span style="color: #0000bb;">$filesize</span><span style="color: #007700;">);&nbsp;}&nbsp;else&nbsp;{&nbsp;</span><span style="color: #0000bb;">$data&nbsp;</span><span style="color: #007700;">=&nbsp;</span><span style="color: #0000bb;">false</span><span style="color: #007700;">;&nbsp;}&nbsp;</span><span style="color: #0000bb;">flock</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">,&nbsp;</span><span style="color: #0000bb;">LOCK_UN</span><span style="color: #007700;">);&nbsp;</span><span style="color: #0000bb;">fclose</span><span style="color: #007700;">(</span><span style="color: #0000bb;">$fp</span><span style="color: #007700;">);&nbsp;return&nbsp;</span><span style="color: #0000bb;">$data</span><span style="color: #007700;">;&nbsp;}&nbsp;else&nbsp;{&nbsp;return&nbsp;</span><span style="color: #0000bb;">false</span><span style="color: #007700;">;&nbsp;}&nbsp;}</span><br> <br> </code> 
      </div> 不知道能否解决你的问题 
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       <span>复制PHP内容到剪贴板</span> 
       <h5 style="cursor: pointer;">PHP代码:</h5> 
       <code style="font-size: 12px;">file_put_contents<span style="color: #007700;">(</span><span style="color: #0000bb;">sys_get_temp_dir</span><span style="color: #007700;">()&nbsp;.&nbsp;</span><span style="color: #dd0000;">'/test.txt'</span><span style="color: #007700;">,&nbsp;new&nbsp;</span><span style="color: #0000bb;">foo</span><span style="color: #007700;">(),&nbsp;</span><span style="color: #0000bb;">LOCK_EX</span><span style="color: #007700;">);</span><br> <br> </code> 
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