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I can not reproduce this bug in my test environment.
Please post Net-SNMP snmpget commands with their results prooving that your 2nd & 3rd hosts are configured to work with SNMPv3 the same way that your 1st host.

Were you by chance polling a single host multiple time to test?  Because that seems to work.  More tests below...


bugtest1.php:

<?php

// bugtest1.php - Test using built-in snmp3_get to multiple hosts
// result: fail

echo snmp3_get('cseoc1260','[REMOVED]','authNoPriv','sha','[REMOVED]','','','SNMPv2-MIB::sysLocation.0')."\n";

echo snmp3_get('cseoc1264','[REMOVED]','authNoPriv','sha','[REMOVED]','','','SNMPv2-MIB::sysLocation.0')."\n";

echo snmp3_get('cseoc2260','[REMOVED]','authNoPriv','sha','[REMOVED]','','','SNMPv2-MIB::sysLocation.0')."\n";

?>

Result:

[REMOVED]:/var/www/scripts$ php bugtest1.php
STRING: EOC Building 1 (Room 1260)
PHP Warning:  snmp3_get(): No response from 172.19.12.12 in /var/www/scripts/bugtest1.php on line 8

PHP Warning:  snmp3_get(): No response from 172.19.12.21 in /var/www/scripts/bugtest1.php on line 10


bugtest2.php:

<?php

// bugtest2.php - Test using built-in snmp3_get to same host
// result: pass

echo snmp3_get('cseoc1260','[REMOVED]','authNoPriv','sha','[REMOVED]','','','SNMPv2-MIB::sysLocation.0')."\n";

echo snmp3_get('cseoc1260','[REMOVED]','authNoPriv','sha','[REMOVED]','','','SNMPv2-MIB::sysLocation.0')."\n";

echo snmp3_get('cseoc1260','[REMOVED]','authNoPriv','sha','[REMOVED]','','','SNMPv2-MIB::sysLocation.0')."\n";

?>

Result:
[REMOVED]:/var/www/scripts$ php bugtest2.php
STRING: EOC Building 1 (Room 1260)
STRING: EOC Building 1 (Room 1260)
STRING: EOC Building 1 (Room 1260)


bugtest3.php:

<?php

// bugtest3.php - Test using NetSNMP snmpget on multiple hosts
// result: pass

echo shell_exec("snmpget -O v -v 3 -l AuthNoPriv -u [REMOVED] -a SHA -A [REMOVED] cseoc1260 SNMPv2-MIB::sysLocation.0");

echo shell_exec("snmpget -O v -v 3 -l AuthNoPriv -u [REMOVED] -a SHA -A [REMOVED] cseoc1264 SNMPv2-MIB::sysLocation.0");

echo shell_exec("snmpget -O v -v 3 -l AuthNoPriv -u [REMOVED] -a SHA -A [REMOVED] cseoc2260 SNMPv2-MIB::sysLocation.0");

?>

Result:
[REMOVED]:/var/www/scripts$ php bugtest3.php
STRING: EOC Building 1 (Room 1260)
STRING: EOC Building 1 (Room 1264)
STRING: EOC Building 2 (Room 2260)


bugtest4.php:

<?php

// bugtest4.php - Test using built-in snmpget on multiple hosts
// result: pass

echo snmpget('cseoc1260','[REMOVED]','SNMPv2-MIB::sysLocation.0')."\n";

echo snmpget('cseoc1264','[REMOVED]','SNMPv2-MIB::sysLocation.0')."\n";

echo snmpget('cseoc2260','[REMOVED]','SNMPv2-MIB::sysLocation.0')."\n";

?>

Result:

[REMOVED]:/var/www/scripts$ php bugtest4.php
STRING: EOC Building 1 (Room 1260)
STRING: EOC Building 1 (Room 1264)
STRING: EOC Building 2 (Room 2260)

Reopen

Please note that you have 'sha' written in low case chars. Try replacing them to SHA (the same way you use in snmpget).

Forget previous comment :)

I have re-checked my configuration and stiil unable to reproduce it:

======================
<?php
echo snmp3_get('127.0.0.1', 'adminSHA', 'authNoPriv', 'sha', 'test1234', '', '', 'SNMPv2-MIB::sysLocation.0') . "\n";
echo snmp3_get('77.[CUT]', 'adminSHA', 'authNoPriv', 'sha', 'test12345', '', '', 'SNMPv2-MIB::sysLocation.0') . "\n";
?>
======================
Works fine for me.
Do you have a possibility to run tests bundled with php-snmp source?

Well, hm.  This got me thinking that all of the devices I've been testing have been Cisco WS-C4510R+E switches with 7-E supervisor engines.  So I tried the same thing on some older WS-C4506 switches with Sup II+ engines and it works just fine.  Not sure where to go from there...

I don't currently have the php-snmp source but could probably get that setup if it would still help.

>Not sure where to go from there...
use tcpdump to dig further. I will close the ticket.