PHP implementation of reading large files and displaying them
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($_GET['action'])){
self::$_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>";
}
$html.="<p class='line'>".$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")){
$line="<font color='red'>".$line."</font>";
}
$html.="<p class='line'>".$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>总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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