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Explain in simple terms: PHP socket communication_PHP tutorial

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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 waiting

3. 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 the ereg function, mysql_escape_string
* 2). Deprecated: mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead.

2. NoticeNotification 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 string

3. WarningWarning level errors
* 1). The number of parameters is incorrect
* 2). Wrong parameter type

4. Fatal errorFatal level error(终止程序继续执行)
* 1). Calling undefined function
* 2). Wrong parameter type

5. parse errorGrammar 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

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 errors

3. 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.

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