WordPress email subject update - phase 2

[ramiy]

WordPress send emails, using wp_mail() function, to inform the site admin when some important tasks are done and when it needs user confirmation.

In #37940 we standardized email subjects used by WordPress. We updated subject texts, added unified translation comments and added site title as a prefix to all the email subjects.

Now we should standardized the filters used to filter WordPress emails. Why? Because not all emails can be filtered.

I prefer to do this in two steps:

1. Separate the email subject from the wp_mail() function.
2. Add new filters to filter the email subject.

See the attached patches.

[ramiy]

This patch removed the email subject translation string from the wp_mail() functions into a separate $subject var.

I should mention that this conventions is used in other places in the code.

As a separate variable, we will be able to filter those email subjects.

[johnbillion]

Related:

• #42132
• #42133
• #42134
• #42135

Unofficial wp_mail() usage docs for reference: ​https://github.com/johnbillion/wp_mail

[ramiy]

@johnbillion Awesome job with the docs!

Let's try to promote the email tickets in 5.3 milestone.

[ramiy]

@johnbillion maybe 5.4 ?