Introduction to how to display error prompts in PHP_PHP Tutorial

The following introduces a method to enable Wusu City prompts in php. Friends in need can refer to it.

1: php.ini configuration

There are two configuration variables related to this in the php.ini configuration. Here are the two variables and their default values:

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display_errors = Off error_reporting = E_ALL & ~E_NOTICE

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display_errors = Off

error_reporting = E_ALL & ~E_NOTICE

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display_errors = On

The purpose of the display_errors variable is obvious - it tells PHP whether to display errors. The default value is Off. Now our purpose is to display an error message, then:

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1 E_ERROR  2 E_WARNING  4 E_PARSE  8 E_NOTICE  16 E_CORE_ERROR  32 E_CORE_WARNING  64 E_COMPILE_ERROR  128 E_COMPILE_WARNING  256 E_USER_ERROR  512 E_USER_WARNING  1024 E_USER_NOTICE  6143 E_ALL  2048 E_STRICT  4096 E_RECOVERABLE_ERROR

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display_errors = On

E_ALL, this setting displays everything from bad coding practices to harmless tips to errors. E_ALL is a bit too detailed for the development process, because it displays a prompt even if the variable is not initialized, and this is a feature of "advanced" PHP. Fortunately, the default value of error_reporting is "E_ALL & ~E_NOTICE", so you will only see errors and bad encoding, and no prompts that are not harmful to the program will be displayed. After modifying php.ini, you need to restart Apache so that it can take effect in apache. Of course, if you only test the program on the command line, you do not need this step. Enemy value macro definition

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1 E_ERROR 2 E_WARNING 4 E_PARSE 8 E_NOTICE 16 E_CORE_ERROR 32 E_CORE_WARNING 64 E_COMPILE_ERROR 128 E_COMPILE_WARNING 256 E_USER_ERROR 512 E_USER_WARNING 1024 E_USER_NOTICE 6143 E_ALL 2048 E_STRICT 4096 E_RECOVERABLE_ERROR http://www.bkjia.com/PHPjc/632168.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632168.htmlTechArticleThe following introduces a method to enable Wusu City prompts in php. Friends in need can refer to it. 1: php.ini configuration There are two configuration variables related to this in the php.ini configuration. Here is this...