Warning Use of undefined constant all - assumed 'all' (this will throw an Error in a future version of PHP) in C\Users\… on line 6

1. How do you solve this will throw an error in a future version of PHP?
2. How do I fix undefined constant in PHP?
3. Is PHP 7.2 deprecated?

How do you solve this will throw an error in a future version of PHP?

In the next major version of PHP, an Error exception will be thrown instead. You can prevent this E_WARNING only if you declare the constant value before using it.

How do I fix undefined constant in PHP?

echo $_POST["email"]; As you can see, the fix here was to place quotes around the string “email”. Here is an example of an associated array that will cause this error: //A custom array $myArray = array( title => 'This is a title', page => 'page-url' );

Is PHP 7.2 deprecated?

PHP 5.6, 7.0, 7.1, and 7.2 End of Life

End of life means these versions will no longer have security support and could be exposed to unpatched security vulnerabilities. As of November 30, 2020, PHP 7.2 reached its end of life.