I just wanted to respond to this to clarify a few points. I’m not sure if it will make a difference to you personally or if you will want to pursue any of the solutions I present here but I thought that it might at least shed some light on your situation and that could at least help someone else dealing with the same issue.
First off, the message that relayed here is a “PHP Notice” not an “error”, and it is not associated with any version of WordPress at all. This notice is not generated by WordPress or even by my plugin but rather by the newer version of PHP that you are running on your server (probably PHP 7.2).
Furthermore, if your server was setup correctly (as a production server should be) than you would not even see this notice or any other minor notice generated by all the other usages of deprecated function. There are even some core files in WordPress 5.0.2 that are using functions that have been deprecated in PHP 7.2. So you see, your server should not even be outputting those notices to your browser at all.
Therefore, the best solution to this issue is to configure PHP for your production server as is recommended in the php.ini file. If you don’t have access to this configuration file on your server then you should talk to your hosting provider about fixing this issue:
I recommend this setting:
error_reporting = E_ALL & ~E_DEPRECATED
FYI, here is the description and recommendations from a standard php.ini file example:
; Error handling and logging ;
; This directive informs PHP of which errors, warnings and notices you would like
; it to take action for. The recommended way of setting values for this
; directive is through the use of the error level constants and bitwise
; operators. The error level constants are below here for convenience as well as
; some common settings and their meanings.
; By default, PHP is set to take action on all errors, notices and warnings EXCEPT
; those related to E_NOTICE and E_STRICT, which together cover best practices and
; recommended coding standards in PHP. For performance reasons, this is the
; recommend error reporting setting. Your production server shouldn’t be wasting
; resources complaining about best practices and coding standards. That’s what
; development servers and development settings are for.
; Note: The php.ini-development file has this setting as E_ALL | E_STRICT. This
; means it pretty much reports everything which is exactly what you want during
; development and early testing.
; Error Level Constants:
; E_ALL – All errors and warnings (includes E_STRICT as of PHP 6.0.0)
; E_ERROR – fatal run-time errors
; E_RECOVERABLE_ERROR – almost fatal run-time errors
; E_WARNING – run-time warnings (non-fatal errors)
; E_PARSE – compile-time parse errors
; E_NOTICE – run-time notices (these are warnings which often result
; from a bug in your code, but it’s possible that it was
; intentional (e.g., using an uninitialized variable and
; relying on the fact it’s automatically initialized to an
; empty string)
; E_STRICT – run-time notices, enable to have PHP suggest changes
; to your code which will ensure the best interoperability
; and forward compatibility of your code
; E_CORE_ERROR – fatal errors that occur during PHP’s initial startup
; E_CORE_WARNING – warnings (non-fatal errors) that occur during PHP’s
; initial startup
; E_COMPILE_ERROR – fatal compile-time errors
; E_COMPILE_WARNING – compile-time warnings (non-fatal errors)
; E_USER_ERROR – user-generated error message
; E_USER_WARNING – user-generated warning message
; E_USER_NOTICE – user-generated notice message
; E_DEPRECATED – warn about code that will not work in future versions
; of PHP
; E_USER_DEPRECATED – user-generated deprecation warnings
; Common Values:
; E_ALL & ~E_NOTICE (Show all errors, except for notices and coding standards warnings.)
; E_ALL & ~E_NOTICE | E_STRICT (Show all errors, except for notices)
; E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR (Show only errors)
; E_ALL | E_STRICT (Show all errors, warnings and notices including coding standards.)
; Default Value: E_ALL & ~E_NOTICE
; Development Value: E_ALL | E_STRICT
; Production Value: E_ALL & ~E_DEPRECATED
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