Use this to change the subject of an email sent by PMPro. This hook returns the subject  and the PMProEmail object.

apply_filters("pmpro_email_subject", string $temail->subject, PMProEmail $this);

Parameters

$temail->subject
string
$this
PMProEmail

Source

File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/classes/class.pmproemail.php

View in Source Code

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Changing PMPro Email Subjects By Jason Coleman