Asterisk phpagi - DIalplan connection

Iam facing some problems here regarding AGI. we are running (freepbx 2.8) asterisk 11.6 and php [login to view URL] we have to check the caller id in dial plan with caller id stored in external CRM by using AGI. For testing purpose we made a rough scenario having script in agi-bin, and calling it from and back to dial plan DIALPLAN: exten => 5678,1,NoOp(*** agi testing***) same => n,AGI([login to view URL],${CALLERID(num)}) same => n,NoOp(*** the result from script is ${result} *** ) PHPAGI SCRIPT: #!/usr/bin/php -q <?php set_time_limit(30); require('[login to view URL]'); error_reporting(E_ALL); $agi = new AGI(); ob_implicit_flush(true); $agi->answer(); $mob=$avgv[1]; $agi->set_variable('result',$mob); CLI OUTPUT: -- Launched AGI Script /var/lib/asterisk/agi-bin/[login to view URL] <SIP/1000-00000012>AGI Tx >> agi_request: [login to view URL] <SIP/1000-00000012>AGI Tx >> agi_channel: SIP/1000-00000012 <SIP/1000-00000012>AGI Tx >> agi_language: en <SIP/1000-00000012>AGI Tx >> agi_type: SIP <SIP/1000-00000012>AGI Tx >> agi_uniqueid: 1386330214.18 <SIP/1000-00000012>AGI Tx >> agi_version: 11.6.0 <SIP/1000-00000012>AGI Tx >> agi_callerid: 1000 <SIP/1000-00000012>AGI Tx >> agi_calleridname: 1000 <SIP/1000-00000012>AGI Tx >> agi_callingpres: 0 <SIP/1000-00000012>AGI Tx >> agi_callingani2: 0 <SIP/1000-00000012>AGI Tx >> agi_callington: 0 <SIP/1000-00000012>AGI Tx >> agi_callingtns: 0 <SIP/1000-00000012>AGI Tx >> agi_dnid: 5678 <SIP/1000-00000012>AGI Tx >> agi_rdnis: unknown <SIP/1000-00000012>AGI Tx >> agi_context: newagitest <SIP/1000-00000012>AGI Tx >> agi_extension: 5678 <SIP/1000-00000012>AGI Tx >> agi_priority: 3 <SIP/1000-00000012>AGI Tx >> agi_enhanced: 0.0 <SIP/1000-00000012>AGI Tx >> agi_accountcode: <SIP/1000-00000012>AGI Tx >> agi_threadid: -1259586704 <SIP/1000-00000012>AGI Tx >> agi_arg_1: 1000 <SIP/1000-00000012>AGI Tx >> -- <SIP/1000-00000012>AGI Script [login to view URL] completed, returning 0 -- Auto fallthrough, channel 'SIP/1000-00000012' status is 'UNKNOWN' we are not getting variable (${result}) back to dialplan. we need exact php script and Dialplan for getting the variable back to dialplan. Hope you can help me out of this.