How to output error message in php

How to output error information in php: first open the php.ini configuration file; then modify the configuration [display_errors = On] to enable error prompts; finally modify the configuration [log_errors = On] to enable logging error information.

The method is as follows:

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By modification php.ini configuration file to output error information

;显示错误信息  
display_errors = On  
;显示php开始错误信息  
display_startup_errors = On  
;日志记录错误信息  
log_errors = On

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Use the ini_set() function to output error information

ini_set('display_errors',1);    //错误信息  
ini_set('display_startup_errors',1);    //php启动错误信息  
error_reporting(-1);    //打印出所有的 错误信息  
ini_set('error_log', dirname(__FILE__) . '/error_log.txt');    //将出错信息输出到一个文本文件

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