Java与PHP的区别
求职之前,一直觉得会被面试官问到这个问题,所以有所准备,发出来和大家讨论下:
PHP面向对象特性不完整(如命名空间,方法重载,多重继承); PHP不支持多线程; PHP对Oracle等数据库支持不好,没有JDBC这样的统一接口; Java将源代码编译为字节码,依赖于各平台的JVM解释运行,而PHP是纯脚本执行编译,在效率上会有影响,不过目前也有一些解决方案将PHP编译为字节码; PHP与C、Shell等都有类似之处,上手快; 一般大学里只教授C++与Java,因此熟悉PHP的应届生并不多,因此有的企业选型也就偏向了Java; 最关键的是,Java和PHP代表了两种企业文化:Java阵营背后站着Sun、Oracle、IBM,从数据库、数据仓库、中间件等都有完善的商业解决方案,而PHP依托的Lamp平台更强调开源和DIY精神,需要使用者自行根据需求调优乃至Hack开源软件,因此银行等企业更倾向于使用Java解决方案,关注业务逻辑,其他上下游服务使用商业产品(尤其是在国内的行业背景,对于一些企业而言,与其冒着风险去投入人力做调优和预研,不如花钱做甲方,至少出了事情直接可以推到乙方身上,曾经有帖子说xx运营商研究院这类机构是运营商的乙方,但是又是其他外包服务公司的甲方,总之就是不会自己去做开发),而在互联网领域PHP应用广泛,在各大公司都有成功的实践,无论是开源组件的发布或是性能调优的交流都日益增多,这和Lamp本身的开源特性是分不开的,Lamp是完全透明可调优的,其中任意一个组件也是可替代的。
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There are four main error types in PHP: 1.Notice: the slightest, will not interrupt the program, such as accessing undefined variables; 2. Warning: serious than Notice, will not terminate the program, such as containing no files; 3. FatalError: the most serious, will terminate the program, such as calling no function; 4. ParseError: syntax error, will prevent the program from being executed, such as forgetting to add the end tag.

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.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

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 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

HTTP request methods include GET, POST, PUT and DELETE, which are used to obtain, submit, update and delete resources respectively. 1. The GET method is used to obtain resources and is suitable for read operations. 2. The POST method is used to submit data and is often used to create new resources. 3. The PUT method is used to update resources and is suitable for complete updates. 4. The DELETE method is used to delete resources and is suitable for deletion operations.

In PHPOOP, self:: refers to the current class, parent:: refers to the parent class, static:: is used for late static binding. 1.self:: is used for static method and constant calls, but does not support late static binding. 2.parent:: is used for subclasses to call parent class methods, and private methods cannot be accessed. 3.static:: supports late static binding, suitable for inheritance and polymorphism, but may affect the readability of the code.

PHP handles file uploads through the $\_FILES variable. The methods to ensure security include: 1. Check upload errors, 2. Verify file type and size, 3. Prevent file overwriting, 4. Move files to a permanent storage location.
