Description:
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It appears that when the params argument was added in commit r293126, the check for argc == 5 was not updated to argc >= 5 at php_imap.c:1230 causing the number of tries/retries to be ignored when 6 arguments are given.

Test script:
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// Next line causes default (2) retries if connection fails
imap_open('{localhost:143/service=imap}', 'user', 'pass', 0, 1, array('DISABLE_AUTHENTICATOR' => 'GSSAPI'));
// Next line causes 0 retries if connection fails
imap_open('{localhost:143/service=imap}', 'user', 'pass', 0, 1);


Expected result:
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Both connection attempts cause 0 retries on failure.

Actual result:
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The first line causes 2 retries (3 total attempts) the second causes 0 retries (1 total attempts).