Notice:use of undefined constant out-assumed ' out ' in d:wampwwwdaoruindex.php on line 4 solution

These are PHP hints rather than errors, and PHP itself does not need to declare variables in advance to be used directly, but is prompted for undeclared variables. Generally as a formal website will turn off the prompts

, and even the error message is turned off:

1. Add error_reporting (E_all & ~e_notice) at the beginning; This sentence indicates that all error messages except E_notice are removed because the post array is an empty array, and this method in the code applies to the subsequent

2. If you feel that the above method is not complete, you can also turn off the PHP prompt function: Search php.ini:error_reporting = E_all instead: error_reporting = e_all & ~e_notice

Notice:use of undefined constant out-assumed ' out ' in d:wampwwwdaoruindex.php for line 4 workaround