Trying to transparent an image php - php

Question

I'm again. I need rlly help, i need put transparent an img php
But i can't get it. I'm rlly newbie on PHP and I want learn. I was reading on PHP.net and I get only remove some problems.
Here's the code:
<?php
header('Content-type: image/jpeg');
$im = file_get_contents("http://fthw.cf/count/index.php?dt=2016-02-13/10:00:00");
$black = imagecolorallocate($im, 0, 0, 0);
imagecolortransparent($im, $black);
imagepng($im, '$img');
imagedestroy($im);
?>
ERROR LOG:
[11-Feb-2016 22:00:17 America/New_York] PHP Warning: imagecolorallocate() expects parameter 1 to be resource, string given in /home/iedgmnuq/public_html/fthw.cf/event/index.php on line 4
[11-Feb-2016 22:00:17 America/New_York] PHP Warning: imagecolortransparent() expects parameter 1 to be resource, string given in /home/iedgmnuq/public_html/fthw.cf/event/index.php on line 5
[11-Feb-2016 22:00:17 America/New_York] PHP Warning: imagepng() expects parameter 1 to be resource, string given in /home/iedgmnuq/public_html/fthw.cf/event/index.php on line 6
[11-Feb-2016 22:00:17 America/New_York] PHP Warning: imagedestroy() expects parameter 1 to be resource, string given in /home/iedgmnuq/public_html/fthw.cf/event/index.php on line 7
Greetings!
PS: help me pls

Answer 1

<?php
function copyTransparent($src, $output)
{
$dimensions = getimagesize($src);
$x = $dimensions[0];
$y = $dimensions[1];
$im = imagecreatetruecolor($x,$y);
$src_ = imagecreatefrompng($src);
// Prepare alpha channel for transparent background
$alpha_channel = imagecolorallocatealpha($im, 0, 0, 0, 127);
imagecolortransparent($im, $alpha_channel);
// Fill image
imagefill($im, 0, 0, $alpha_channel);
// Copy from other
imagecopy($im,$src_, 0, 0, 0, 0, $x, $y);
// Save transparency
imagesavealpha($im,true);
// Save PNG
imagepng($im,$output,9);
imagedestroy($im);
}
$png = 'file.png';
copyTransparent($png,"png.png");
?>
Here is a function you can use to make a image transparent