[php]Variabile booleana non riconosciuta

Salve a tutti.
Sto scrivendo una shell ftp usabile da riga di comando.
Ecco il codice:

<?php
error_reporting("E_ALL &~ E_NOTICE &~ E_WARNING");
function Line($t) {
    $a = fopen("actions.log", "a");
    fwrite($a, $t);
    fclose($a);
}
if($argc < 4)
    die("Usage: ".$argv[0]." <host> <user> <pass>");
$mode = "ascii";
$log = false;
$init = false;
$h = ftp_connect($argv[1]) or die("Error: Unable to connect at the host ".$host);
$l = ftp_login($h, $argv[2], $argv[3]) or die("Error: invalid name or password");
print "Type 'help' for a list of commands\n";
print "For files big more than 1 mb the download takes more time\n";
while(1) {
    $dir = ftp_pwd($h).((ftp_pwd($h) == "/") ? "" : "/");
    if($log === true && $init === false) {
        if(file_exists("actions.log"))
            unlink("actions.log");
        $a = fopen("actions.log", "a");
        fwrite($a, "Inizio sessione ".date("D d/m/Y G:i:s")."\r\n");
        fclose($a);
        $init = true;
    }
    print "ftp >";
    $c = fread(STDIN, 50);
    $c = trim($c);
    $c = str_replace("\n","",$c);
    $c = str_replace("\r\n","",$c);
    if(eregi("up", $c) && $c != "dup") {
        $a = explode(" ",$c);
        $f = ftp_put($h, $dir.$a[1], $a[1], (($mode == "ascii") ? FTP_ASCII : FTP_BINARY));
        print ($f) ? "File upload successful\n" : "Error: file upload unsuccessful\n";
    } elseif(eregi("del", $c)) {
        $a = explode(" ",$c);
        $f = ftp_delete($h, $dir.$a[1]);
        print ($f) ? "File delete successful\n" : "Error: file delete unsuccessful\n";
    } elseif(eregi("get", $c)) {
        $a = explode(" ",$c);
        $f = ftp_get($h, getcwd()."/".$a[1], $dir.$a[1], FTP_BINARY);
        print ($f) ? "File download successful\n" : "Error: file download unsuccessful\n";
    } elseif(eregi("rename", $c)) {
        $a = explode(" ",$c);
        $f = ftp_rename($h, $dir.$a[1], $dir.$a[2]);
        print ($f) ? "File rename successful\n" : "Error: file rename unsuccessful\n";
    } elseif(eregi("mkdir", $c)) {
        $a = explode(" ",$c);
        $f = ftp_mkdir($h, $dir.$a[1]);
        print ($f) ? "Directory create successful\n" : "Error: directory create unsuccessful\n";
    } elseif(eregi("rmdir", $c)) {
        $a = explode(" ",$c);
        $f = ftp_rmdir($h, $dir.$a[1]);
        print ($f) ? "Directory delete successful\n" : "Error: directory delete unsuccessful\n";
        ftp_cdup($h);
        $dir = ftp_pwd($h);
    } elseif($c == "dir") {
        print join("\n",ftp_nlist($h, $dir))."\n";
    } elseif(eregi("goto", $c)) {
        $a = explode(" ",$c);
        $f = ftp_chdir($h, $dir.$a[1]);
        print "New work directory: ".$dir.$a[1]."\n";
    } elseif($c == "binary") {
        $mode = "binary";
        print "Mode changed in ".$mode."\n";
    } elseif($c == "dup") {
        ftp_cdup($h);
        print "New work directory: ".ftp_pwd($h)."\n";
        continue;
    } elseif($c == "root") {
        ftp_chdir($h, "/");
        print "New work directory: ".ftp_pwd($h)."\n";
    } elseif($c == "ascii") {
        $mode = "ascii";
        print "Mode changed in ".$mode."\n";
    } elseif($c == "quit") {
        break;
    } elseif(eregi("log", $c)) {
        $a = explode(" ",$c);
        $log = ($a == "on") ? true : false;
        print "Log set ".$a[1]."\n";
    } elseif($c == "help") {
        print "This is a list of commands:\n";
        print "up <file> \t\t Upload a file\n";
        print "del <file/dir> \t\t Delete a file\n";
        print "get <file> \t\t Download a file\n";
        print "rename <file/dir> \t Rename a file\n";
        print "mkdir <dir> \t\t Make a directory\n";
        print "rmdir <dir> \t\t Delete a directory\n";
        print "dir \t\t\t Show files in the current work directory\n";
        print "goto <dir> \t\t Go to a directory\n";
        print "binary \t\t\t Set the ftp_mode at binary\n";
        print "dup \t\t\t Go to the top directory\n";
        print "root \t\t\t Return to the root directory\n";
        print "ascii \t\t\t Set the ftp_mode at ascii\n";
        print "quit \t\t\t Exit from the shell\n";
        print "help \t\t\t Show this help\n";
    } else {
        print "Invalid command\n";
    }
}
ftp_quit($h);
exit(1);
?>

Come vedete, se do il comando

log on

dovrebbe crearsi un file chiamato actions.log, ma ciò non succede. Chi sa dirmi perchè?

$a è un array, ma tu lo confronti come se fosse una stringa.


Ciao!

Ah grazie debug, piccola svista