I want to make avatars default to minecraft skin

<?php
    header('Content-Type: image/png');
     
    $player_name = 'wide_load';
    $width = 200;
    $height = 200;
     
    $cache_file = "cache/player_skins/faces/{$player_name}_{$width}x{$height}.png";
     
    if (!file_exists($cache_file) || time() - filemtime($cache_file) > 86400){
            $skin = imagecreatefromstring(file_get_contents("http://s3.amazonaws.com/MinecraftSkins/{$player_name}.png"));
           
            $face = imagecreatetruecolor($width, $height);
           
            imagecopyresized($face, $skin, 0, 0, 8, 8, $width, $height, 8, 8);
            imagecopyresized($face, $skin, 0, 0, 40, 8, $width, $height, 8, 8);
           
            imagepng($face, $cache_file);
    }
     
    readfile($cache_file);
?>