1. Why undefined variables appear
Undefined variables usually appear in the following situations:
Variable is spelled incorrectly.
Variable has not been declared or assigned a value.
The variable scope is incorrect.
2. How to turn off undefined variable notice
We can turn off undefined variable notice by modifying the php.ini file or configuring it within the application. Below are detailed instructions for both methods.
Modify the php.ini file
Open the php.ini file and find the error_reporting configuration item in it. Change its value to the following code:
error_reporting = E_ALL & ~E_NOTICE & ~E_STRICT
This configuration will turn off the prompt for undefined variables.
Configure in the application
Configure in the ThinkPHP application, even if you don't want to change the php.ini file. First, find the following code in the public/index.php file:
define('APP_DEBUG', true);
Change the value of APP_DEBUG to false. This turns off all debugging information, including undefined variable prompts.
In addition to turning off all debugging information, we can also turn off undefined variables. The following code can be added to the config.php file:
'display_not_found_error' => false,
'trace_exception' => false,
The above configuration will be Turn off undefined variable prompts in the application.
thinkphp is a free development framework that can be used to develop front-end web pages. The earliest thinkphp was created to simplify development. Thinkphp also follows the Apache2 protocol. It was originally Evolved from Struts, we also make use of some good foreign framework patterns, use object-oriented development structures, and are compatible with many tag libraries and other patterns. It can develop and deploy applications more conveniently and quickly, and of course it is not just enterprise-level applications. , any PHP application development can benefit from the simplicity, compatibility and speed of thinkphp.
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