PHP implementation of reading large files and displaying them-PHP Tutorial-php.cn

PHP implementation of reading large files and displaying them

墨辰丷

Release： 2023-03-29 08:52:01

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本篇文章主要介绍PHP实现读取大文件并显示的实例，感兴趣的朋友参考下，希望对大家有所帮助。

使用PHP读取日志文件，当文件比较大的时候，会报内存不足，因此应该部分读取，读取指定的行数的数据

PHP代码：

<?php
class Test{
  //日志路径
  const LOG_PATH="E:\phpServer\Apache\logs\error.log";
  const NGINX_LOG_PATH="E:\phpServer\\nginx\logs\error.log";
  //显示的行数
  const PAGES=50;
  public static function main(){
    header("content-type:text/html;charset=utf-8");
    
    if(!empty($_GET[&#39;action&#39;])){
      self::$_GET[&#39;action&#39;]();
      exit;
    }
  }

  public static function showApacheLogs(){
    $test=new Test();
    $result=$test->readLogs(self::LOG_PATH,self::PAGES);
    $html="";
    foreach($result as $line){
      if(strpos($line,"error:")){
        $line="<font color=&#39;red&#39;>".$line."</font>";
      }
      $html.="<p class=&#39;line&#39;>".$line."<p>";
    }
    echo $html;
  }
  public static function showNginxLogs(){
    $test=new Test();
    $result=$test->readLogs(self::NGINX_LOG_PATH,self::PAGES);
    $html="";
    foreach($result as $line){
      if(strpos($line,"error")){
        $line="<font color=&#39;red&#39;>".$line."</font>";
      }
      $html.="<p class=&#39;line&#39;>".$line."<p>";
    }
    echo $html;
  }
  /**
  * 读取日志
  */
  private function readLogs($filePath,$num=20){
    $fp = fopen($filePath,"r");
    $pos = -2; 
    $eof = ""; 
    $head = false;  //当总行数小于Num时，判断是否到第一行了 
    $lines = array(); 
    while($num>0){ 
      while($eof != "\n"){ 
        if(fseek($fp, $pos, SEEK_END)==0){  //fseek成功返回0，失败返回-1 
          $eof = fgetc($fp); 
          $pos--; 
        }else{                //当到达第一行，行首时，设置$pos失败 
          fseek($fp,0,SEEK_SET); 
          $head = true;          //到达文件头部，开关打开 
          break; 
        } 
         
      } 
      array_unshift($lines,fgets($fp)); 
      if($head){ break; }         //这一句，只能放上一句后，因为到文件头后，把第一行读取出来再跳出整个循环 
      $eof = ""; 
      $num--; 
    } 
    fclose($fp); 
    return array_reverse($lines); 
  }
}
Test::main();
?>
<style type="text/css">
*{
  padding: 0;
  margin: 0;
}
.logsBox{
  margin:5px;
  padding: 5px;
  width: 600px;
  background: #000;
  color:#fff;
  font-size: 13px;
  float: left;
}
.logsBox .line{
  margin: 12px 0;
}
</style>
<p class="logsBox apache">
  <p class="line">日志读取...</p>
</p>
<p class="logsBox nginx">
  <p class="line">日志读取...</p>
</p>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript">
  $(function(){

    function showLogs(api,showClass){
      function readLogs(){
        $.ajax({
          url:api,
          type:"get",
          dataType:"text",
          success:function(data){
            $(showClass).html(data);
          }
        });
      }
      readLogs();
      setInterval(readLogs,5000);
    }
    showLogs("?action=showNginxLogs",".nginx");
    showLogs("?action=showApacheLogs",".apache");
  });
</script>

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