clean this code

<?php
$str = <<<EOD

Event: MusicOnHoldStop
Privilege: call,all
Channel: SIP/callcentric-0000007c
ChannelState: 6
ChannelStateDesc: Up
CallerIDNum: 0411
CallerIDName: <unknown>
ConnectedLineNum: 2066013560
ConnectedLineName: 109
AccountCode:
Context: recording
Exten:
Priority: 1
Uniqueid: 1448837557.211

EOD;


//echo $str;

$result = stristr($str, 'event');
$a=str_replace(" ","<br>","$result");


$b=stristr($str, 'event');


echo "<br>";


echo "$b";
$c=explode(" ",$b);

echo "<br><br>";

echo $c[0];
?>