PHP 读取大文件并显示的简单实例(推荐)

<?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($_get['action'])){
      self::$_get['action']();
      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:")){
        $line="<font color='red'>".$line."</font>";
      }
      $html.="<div class='line'>".$line."<div>";
    }
    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")){
        $line="<font color='red'>".$line."</font>";
      }
      $html.="<div class='line'>".$line."<div>";
    }
    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>
<div class="logsbox apache">
  <div class="line">日志读取...</div>
</div>
<div class="logsbox nginx">
  <div class="line">日志读取...</div>
</div>
<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>