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。
相关推荐：
The above is the detailed content of PHP implementation of reading large files and displaying them. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1423
52
1317
25
1268
29
1246
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
