imagecopy PHP for progress bar doesn't work - php

Question

I have a problem making the imagecopy function work in PHP.
I don't even know where to start debugging; images is a new fruit for me.
Portion where I have problem:
imagecopy($png, $bgr, 0, 0, 0, 0, 0, 0, $width, $height);
imagecopy($png, $bgr, 0, 0, 0, 0, 0, 0, imagesx($pbuble), imagesy($pbuble));
Full code (my plan is first to copy on top of $png <- $bgr <- $pbuble):
<?php
//Check for correct GET variables
if (is_numeric($_GET['max']) AND is_numeric($_GET['val'])) {
$max = $_GET['max'];
$val = $_GET['val'];
} else {return false;}
//Create empty placeholder
$png = imagecreate(380, 37);
$black = imagecolorallocate($png, 0, 0, 0);
imagecolortransparent($png, $black);
//Create background image with transparency
$bgr = imagecreatefrompng("progress-bgr.png");
imageAlphaBlending($bgr, true);
imageSaveAlpha($bgr, true);
//Calculate width of progress bar atm
$width = imagesx($bgr);
$height = imagesy($bgr);
$pb_width = $val * $width / $max;
//Percentage buble
$pbuble = imagecreatefrompng("percentage-bubble.png");
imageAlphaBlending($pbuble, true);
imageSaveAlpha($pbuble, true);
$perct = $val * 100 / $max;
$txt = $perct . "%";
$txt_color = imagecolorallocate($pbuble, 255, 255, 255);
$font = "dejavusans-webfont.ttf";
$font_size = 7;
$bbox = imagettfbbox($font_size, 0, $font, $txt);
$x = $bbox[0] + (imagesx($pbuble) / 2) - ($bbox[4] / 2);
//$y = $bbox[1] + (imagesy($pbuble) / 2) - ($bbox[5] / 2);
imagettftext($pbuble, $font_size, 0, $x, 14, $txt_color, $font, $txt);
//
imagecopy($png, $bgr, 0, 0, 0, 0, 0, 0, $width, $height);
imagecopy($png, $bgr, 0, 0, 0, 0, 0, 0, imagesx($pbuble), imagesy($pbuble));
//Output image
header("Content-type: image/png");
imagepng($png);
//
imagedestroy($png);
imagedestroy($bgr);
imagedestroy($pbuble);
?>

Answer 1

Stupid me :)
imagecopy($png, $bgr, 0, 0, 0, 0, 0, 0, $width, $height);
has two extra parameters.
should be:
imagecopy($png, $bgr, 0, 0, 0, 0, $width, $height);