Hangup cause in asterisk using phpagi

hangup_cause.php

<?php
require_once('phpagi.php');
$agi = new AGI();


$clid = $agi->request['agi_callerid'];  // -Caller ID
$dest = $agi->request['agi_dnid'];  // -Destination id
$uid = $agi->request['agi_uniqueid'];
$rdnis =$agi->request['agi_rdnis']; //Redirected Dialed Number Information Service

$hangupcause_string=$agi->get_variable("HANGUPCAUSE_KEYS()");

$hangupcause_string_data = $hangupcause_string['data'];

$hanupcause_code=$agi->get_variable("HANGUPCAUSE($hangupcause_string_data,tech)");

$hangupcause_code_data = $hanupcause_code['data'];

$hangupcause_ast=$agi->get_variable("HANGUPCAUSE($hangupcause_string_data,ast)");

$hangupcause_ast_data = $hangupcause_ast['data'];

$agi->set_variable("HANGUPPPPPPPPPCAUSE STRING DATA",$hangupcause_string_data);
$agi->set_variable("HANGUPPPPPPPPPCAUSE CODE DATA",$hangupcause_code_data);
$agi->set_variable("HANGUPPPPPPPPPCAUSE AST DATA",$hangupcause_ast_data);
?>