php print error message

Method 1 Modify php.ini (Recommended learning: PHP video tutorial)

;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

Method 2 Add

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

ini_set

to the header of the php file that needs to be debugged to set the value of the specified configuration option. This option will retain its new value while the script is running, and will be restored when the script ends.

rror_reporting() function can set the error_reporting directive at runtime.

PHP has many error levels. Use this function to set the level when the script is running. If the optional level argument is not set, error_reporting() simply returns the current error reporting level.

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