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Home Backend Development PHP Problem How to open error log in php

How to open error log in php

Mar 09, 2021 pm 05:26 PM
php error log

How to open the error log in php: 1. Open the php.ini configuration file, find the "log_errors" option, and change the value of this option from "Off" to "On". 2. Use the ini_set() function to modify the PHP file, with the syntax "ini_set("log_errors", "On");".

How to open error log in php

The operating environment of this article: windows10 system, php8, thinkphp t480 computer.

Turn on the error log. PHP provides two methods.

Method 1: Modify the php.ini file

Just make the following modifications in the php.ini configuration file:

1. error_reporting  =  E_ALL    #將會(huì)向PHP報(bào)告發(fā)生的每個(gè)錯(cuò)誤
2. display_errors = Off    #不顯示滿(mǎn)足上條 指令所定義規(guī)則的所有錯(cuò)誤報(bào)告,設(shè)置成off發(fā)生錯(cuò)誤時(shí),瀏覽器報(bào)500,不顯示具體錯(cuò)誤(具體錯(cuò)誤不會(huì)輸出到瀏覽器上,用戶(hù)也就看不到。會(huì)寫(xiě)到第5步的錯(cuò)誤文件中,非正式環(huán)境全設(shè)置成on更方便) 
3. log_errors = On    #開(kāi)啟錯(cuò)誤日志  
4. log_errors_max_len = 1024    #設(shè)置每個(gè)日志項(xiàng)的最大長(zhǎng)度  
5. error_log =/usr/local/error.log    #指定產(chǎn)生的 錯(cuò)誤報(bào)告寫(xiě)入的日志文件位置

PHP After the configuration file is set as above, restart the web server. In this way, when executing any PHP script file, all error reports generated will not be displayed in the browser, but will be recorded in the error log /usr/local/error.log specified by you.

In addition, not only can all errors that meet the rules defined by error_reporting be recorded, but also the error_log() function in PHP can be used to send a user-defined error message and be written to the error_log. Or if an error occurs intentionally, such as running echO, the triggered error will be written to the error log of PHP.

Method 2: Use the ini_set() function

ini_set("log_errors", "On");//開(kāi)啟錯(cuò)誤日志
ini_set("display_errors", "On");//打開(kāi)錯(cuò)誤提示
ini_set("error_reporting", E_ALL);//顯示所有錯(cuò)誤

PHP ini_set is used to set the value of php.ini, which takes effect when the function is executed and the script ends Afterwards, the settings become invalid. You can modify the configuration without opening the php.ini file, which is very convenient for virtual spaces.

Extended knowledge:

Error levels include:

E_ALL                  - 所有錯(cuò)誤和警告(包括PHP 5.4.0中的E_STRICT)
E_ERROR                - 致命的運(yùn)行時(shí)錯(cuò)誤
E_RECOVERABLE_ERROR    - 幾乎致命的運(yùn)行時(shí)錯(cuò)誤
E_WARNING              - 運(yùn)行時(shí)警告(非致命錯(cuò)誤)
E_PARSE                - 編譯時(shí)解析錯(cuò)誤
E_NOTICE               - 運(yùn)行時(shí)通知(這些通常是警告,從您的代碼中的錯(cuò)誤,但它可能是故意的(例如,使用未初始化的變量和賴(lài)于它自動(dòng)初始化為一個(gè)事實(shí)空字符串)
E_STRICT               - 運(yùn)行時(shí)通知,允許PHP建議更改您的代碼將確保最佳的互操作性,并轉(zhuǎn)發(fā)代碼的兼容性
E_CORE_ERROR           - PHP初始啟動(dòng)期間發(fā)生的致命錯(cuò)誤
E_CORE_WARNING         - PHP期間發(fā)生的警告(非致命錯(cuò)誤),初次啟動(dòng)
E_COMPILE_ERROR        - 致命的編譯時(shí)錯(cuò)誤
E_COMPILE_WARNING      - 編譯時(shí)警告(非致命錯(cuò)誤)
E_USER_ERROR           - 用戶(hù)生成的錯(cuò)誤消息
E_USER_WARNING         - 用戶(hù)生成的警告消息
E_USER_NOTICE          - 用戶(hù)生成的通知消息
E_DEPRECATED           - 警告代碼在將來(lái)的PHP版本中不起作用
E_USER_DEPRECATED      - 用戶(hù)生成的棄用警告

The most common combination settings of error_reporting:

E_ALL (顯示所有錯(cuò)誤,警告和通知,包括編碼標(biāo)準(zhǔn)。)
E_ALL & ~E_NOTICE  (顯示所有錯(cuò)誤,通知除外)
E_ALL & ~E_NOTICE & ~E_STRICT  顯示所有錯(cuò)誤,通知和編碼標(biāo)準(zhǔn)警告除外。)
E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR  (僅顯示錯(cuò)誤)

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