Which one is better, php or java? Both prospects are very good. PHP is suitable for beginners to do rapid development of website programming, and JAVA is suitable for software development. There is no absolute good or bad, existence is reasonable. It’s just that the application scenarios are different.
Both prospects are very good. PHP is suitable for beginners to do rapid development of website programming, and JAVA is suitable for software development. When choosing training, you must choose a suitable training institution. Don't choose blindly. A good training institution can help you quickly master development skills and save a lot of time. The PHP online live class of the PHP Chinese website will be held regularly. Everyone is welcome to learn and learn.
The unique syntax mixes C, Java, Perl and PHP's own syntax. It can execute dynamic web pages faster than CGI or Perl. Compared with other programming languages, dynamic pages made with PHP embed programs into HTML (an application under the Standard Universal Markup Language) document for execution, and the execution efficiency is much higher than CGI that completely generates HTML tags; PHP can also execute compiled code. Compilation can achieve encryption and optimize code running, making the code run faster.
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var_dump('hello word');
?>The title here is about talking about the difference between PHP and JAVA. It is actually a euphemism. In fact, others want to know whether PHP or JAVA is better! ! ! So as to find a sense of presence in it! ! !
Because I switched from php development to java development for many years. So most of all, several colleagues ask me from time to time, do you think Java or PHP is better? My answer every time is, each has its own merits and benefits. This is the most practical answer.
Then, think about the difference. Today I will carefully summarize the differences between php and java.
1. PHP is ready to write and use.
That is to say, only one change is completed at a time, and the user sees the effect immediately, while Java is much slower. After the code change is completed, it needs to be recompiled and then the jvm restarted. The time spent in the middle is Quite a few, and restarting the jvm process will interrupt user response.
2. PHP writes things quickly.
php can be said to be very agile. Given a requirement, as long as the later performance and user volume issues are not considered, it is quite fast. You can even write directly without a framework. It’s very fast. It only takes 30-50 lines of code to write an add, delete, modify, and check function. Java is much slower. First of all, you need to think about what framework to use. Currently, it is basically spring. Then you need to configure various databases, filters, and servlets, decide whether to use mybatis or hibernate, and then consider the transfer of codes, and then Think about business. . . Then keep debugging, and you can imagine that it may take several minutes to wait for the code to be changed.
3. The surface thinking of php is clearer.
What is the superficial idea? What you see is what is actually made. For example, echo "hello world" outputs hello world, but Java is different. You may write it in response. , it may be written in the modelattribute, or it may be that the string is returned, and then somehow it is displayed on the page.
4. php takes up less memory.
php handles problems in a process manner and takes up very little memory. It can be said that you will have no problem deploying 50 projects on one machine, as long as the number of visits does not increase, it can be done. But Java doesn't work. Every time Java starts a project, it has to use up a lot of memory. For example, on a machine with 8g of memory, running two projects is usually enough. [Related recommendations: PHP Video Tutorial]
Having said the benefits of PHP, doesn’t Java have any benefits? That's impossible too.
1. There are many java components.
I personally feel that this point alone outweighs all other advantages, because there are many components, which means there are many people using it, and the public’s eyes are sharp. Therefore, Java must be good. It has accumulated too many things and cannot be easily replaced by a new language. Whatever you want to do, search carefully for Java components. You may have the functions you need. Especially for the most popular big data industry, Java is even more dominant. PHP is a little helpless in this scenario.
2. Java thread pool, connection pool, asynchronousization is convenient.
In fact, this point is very similar to the first point. Because there are many components, it is very convenient to use thread pool and connection pool. This is absolutely necessary for high concurrency and high performance scenarios. of. Because Java runs multi-threaded, there is no need to initialize many basic things every time. This saves a lot of time, and therefore everyone can tolerate the slow process of server startup because it only happens once. PHP, on the other hand, is multi-process and needs to reload all the required code every time. Therefore, some commonly used data cannot be saved in the memory. The connection pool is not easy to do, and asynchronous operation is a big shortcoming.
3. Java is truly logically clear.
Because, in Java, you can start from one entry and use IDE tools to analyze the deepest logical operations. For each field, you can clearly understand it. This is actually an interface and a complete object. Advantages of use. PHP cannot do this, or very few people bother to do it. PHP can be said to be semi-object-oriented and semi-process-oriented development. Therefore, it is normal to insert several custom function calls during the calling process. Then it is not so easy if you want to analyze the call chain through a simple IDE. For example, for interfaces provided by third parties, it is difficult for PHP to clearly see what the interface returns unless you print it out, but printing may not be correct because some return value data may not be reflected. This adds a big threshold to understanding the code.
4. Although Java compilation is troublesome, it can detect errors for you in advance.
Java compilation is indeed more time-consuming, but if there are obvious errors, the compilation will not pass, which gives you an opportunity to re-check the code. But PHP will not. No matter how poorly you write, it will not give you any prompts. In many cases, it is often because you have written a missing semicolon, causing you to troubleshoot for hours.
5. Java remote calling is convenient, rmi, hessian, dubbo.
No matter what, remote and local calls are very convenient to know relevant information, and Java's same language calls do not use pure http calls, but maintain a certain connection, thus greatly improving performance. PHP also has remote calling, but it is relatively weak. [Related recommendations: java video tutorial]
Which is better, PHP or Java? In fact, there is no absolute good or bad problem, and its existence is reasonable. It’s just that the application scenarios are different.