Explanation in simple terms: PHP socket communication
1. Common error types in php
1. Syntax error
* 1). Write less semicolons
*2). . . . . . .2. Environment error
* 1). PHP configuration waiting3. Logic errors
* 1). I wanted to use one equal sign, but ended up using two equal signs
2. Defined error types
错误名 | 错误描述 |
---|---|
E_ALL |
所有的错误和报告 |
E_ERROR |
致命的运行时错误,脚本的执行被 |
E_WARBING |
运行时警告(非致命性),脚本的执行不会被暂停 |
E_PARSE |
编译时解析错误 |
E_NOTICE |
运行时提醒 |
E_STRICT |
启动php对代码的修改建议,以确保代码具有最佳的互操作性和向前兼容性 |
E_DEPRECATED |
运行时通知,启动后将会对在未来版本中可能无法正常工作的代码给出警告 |
E_CORE_ERROR |
发生于php启动时初始化过程中的致命错误 |
E_CORE_WARNING |
发生于php启动时初始化过程中的警告错误(非致命性) |
E_COMPILE_ERROR |
编译时致命性错 |
E_COMILE_WARNING |
编译时警告(非致命性错) |
E_USER_ERROR |
用户产生的出错消息 |
E_USER_WARNING |
用户产生的警告消息 |
E_USER_NOTICE |
用户产生的提醒消息 |
E_USER_DEPRECATED |
用户产生的警告信息,类似E_DEPRECATED,但是是通过trigger_error 函数产生的 |
E_RECOVERABLE_ERROR |
可被捕获的指明错误,她表示可能发生了一个非常危险的错误,但是还没有导致PHP引擎处于不稳定状态。如果该错误没有被用户自定义句柄捕获(参见set_error_handler() ),将成为一个E_ERROR,从而脚本会终止运行。 |
Error level in 3.php
1.
Deprecated(不推荐|过时)
Error
* 1).最低级的错误
For example, use theereg
function, mysql_escape_string
* 2).Deprecated: mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead.
2.
Notice
Notification level error
* 1). Access undefined variables
* 2). When accessing an array, $arr["name"]; the program will first search for the constant name. If it is not found, the name will be treated as a string3.
Warning
Warning level errors
* 1). The number of parameters is incorrect
* 2). Wrong parameter type4.
Fatal error
Fatal level error(终止程序继续执行)
* 1). Calling undefined function
* 2). Wrong parameter type5.
parse error
Grammar parsing error
* 1). If the check phase has not passed, any other errors will not be seen because it has not gone anywhere yet,程序还没解析成功
6.
E_USER_相关的错误
* 1). If the check phase has not passed, any other errors will not be seen because it has not gone anywhere yet,程序还没解析成功
4. Error-related options in the php configuration file
选项 | 描述 |
---|---|
error_reporting | 设置错误报告的级别 |
display_error | 是否显示错误 |
log_errors | 设置是否将产生的错误信息记录到日志或者error_log |
error_log | 设置错误日志的保存文件 |
log_errors_max_len | 设置log_errors的最大字节数 |
ignore_repeated_errors | 是否忽略重复的错误信息 |
ignore_repeated_source | 是否忽略重复的消息来源 |
track_errors | 如果开启此选项,最后一个错误将永远保存在$php_errormsg 中 |
5. How to set error level
1. Modify the value of error_reporting in the configuration file
2. Set
error_reporting函数
through
in the code * 1.error_reporting(0); does not display errors except E_PARSE
* 2.error_reporting(-1) | error_reporting(E_ALL) displays all errors3. Use the ini_set(‘error_reporting’, 0) function to set
at runtime
6. Suppress error output symbols@
1.
@
settype()
7. Trigger PHP errors through trigger_error
The function of triggering errors is not limited to the PHP parser. Errors can also be triggered through the trigger_error()
function. trigger_error(‘error message’, custom error, such as: (E_USER_NOTICE) ) trigger_error(‘custom error message’, E_USER_NOTICE); This function will not interrupt the program to continue execution.

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.


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