It's like the su command for ZfcUser & ZF3.
In your modules.config.php, set up
'ZfcUser', 'ZfcUserSubstitute'Then, when logged in, hit the following URI:
/admin/user/substitute/<existing user ID>
Ensure the above is locked down with access controls!
Then, to exit, hit the following URI:
/admin/user/unsubstitute
You can put this exit on the UI as follows:
<?php if ($this->originalIdentity()): ?>
<a href="<?php echo $this->url('zfcusersubstitute/unsubstitute') ?>">Back to original user</a>
<?php endif; ?>