今天主要的任务就是对新闻、研究报告等咨询的最近上传时间和本地的时间进行对比,比较一下是否超过1个小时,然后我对此进行了php的编程
刚开始,我本来以为主页中就有所需要处理的文字的信息,但是我找了好久就是没有发现所要查找的文字的信息,刚开始的时候我并没有发现然后一直在那傻傻地用正则表达式处理html的源代码,后来我发现原来是我自己的问题,原来html源代码中并不包含新闻的代码。然后我就用chrome对页面进行查找,终于找到了新闻页面来源的url。然后对url进行处理。
在对url进行处理的时候,我就直接用正则表达式处理,可是在处理的时候出现了各种各样的问题。首先时间字符串的长度随着时间的变化可能会变得不一样,所以一开始我并不知道怎么去处理,然后尝试了好久,后来,我尝试用.*的方式对文字进行匹配,可是因为在php中默认采用的是贪婪匹配,所以一匹配就是匹配所有的东西,然后我就对此进行搜索,查找解决的方法,找了很久都不能找到。
后来,我问了一下我的一个同学,他和我说了正则表达式默认是采用贪婪匹配的方式,而可以改变模式为非贪婪匹配就可以解决这个问题。
打个比方说,有一段html:<div>asdef<em>ccda</em>aae<br>sdc</div><div>asdef<em>dfge</em><br>sdc</div>。我想通过preg_match_all利用规则<div>\s*<br>将<div>asdef<em>ccda</em>aae<br>匹配出来,但是PHP好像并没有非贪婪模式的选项,导致匹配出来的是内容是<div>asdef<em>ccda</em>aae<br>sdc</div> <div>asdef<em>dfge</em>,因为贪婪模式匹配到了后面的<br>了 <pre name="code" class="sycode">/正则/U 参数U,用书上的原话是,不再贪婪
然后我终于解决了问题
<?php /*判断最近更新时间是否大于一个小时函数*/function limittimeindex($url){ $info=file_get_contents($url);/*获取url的页面*/ preg_match('/date.*\",/U',substr($info,0),$m,PREG_OFFSET_CAPTURE);/*正则匹配字符串*/ $time=substr($m[0][0],7,-2);/*获取最新的网页更新时间*/ $systime=date("Y-m-d H:i:s");/*获取系统时间*/ if(strtotime($systime)-strtotime($time)>=3600){/*比较系统时间是否大于最近更新时间1小时,如果是则错误,如果不是则正确*/ echo "this is false<br>"; } else{ echo "this is true<br>"; } echo $time,"<br>"; echo $systime;}echo "";if(isset($_POST['url']) && $_POST['url']!=''){ $url2=$_POST['url']; limittimeindex($url2);}?>
http://zhidao.baidu.com/question/110658951.html?qq-pf-to=pcqq.c2c

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

WebStorm Mac version
Useful JavaScript development tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Zend Studio 13.0.1
Powerful PHP integrated development environment