mib binary to text converter

<?php
function makeStringGood($str) {
    return str_replace(array("\r",' '),array('','_'),trim($str));
}
function isOid($str) {
    if($str[0]==='1')
    return true;
    else
    return false;
}
$file = file_get_contents('mibs.bin');
$fileArray = explode(chr(0),$file);
//print_r($fileArray);
$infoArray = array();
$bitArray = array();
foreach($fileArray as $line0) {
    $line = makeStringGood($line0);
    if(strlen($line)>0) {
    //echo "$line\n";
    $infoArray[]=$line;
    $bitArray[]=isOid($line);
    }
}
//print_r($bitArray);
$sections=array();
//$sections2=array();//hashmap
foreach($bitArray as $i => $oidFlag) {
    if($oidFlag) {
    if(isset($bitArray[$i-1])) {
        if($bitArray[$i]===true) {
        if($bitArray[$i-1]===true) {
            $sections[]=$i;
        } else {
            $sections[]=$i-1;
        }
        }
    }
    }
}
//print_r($sections);
$unknownNum=0;
foreach($sections as $i => $startSection) {
    if(isset($sections[$i+1]))
    $endSection = $sections[$i+1];
    else
    $endSection = $startSection;
    for($j = $startSection;$j<$endSection;$j++) {
    //echo $infoArray[$j]."\n";
    if($j===$startSection) {
        if(isOid($infoArray[$j]))
        echo 'unknown'.$unknownNum++.' '.$infoArray[$j];
        else
        echo $infoArray[$j];
    } else {
        echo ' '.$infoArray[$j];
    }
    }
    echo "\n";
}

?>