自动缓存图标

php自动缓存图标
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$url = @$_GET['url'];
stream_context_set_default( [
    'ssl' => [
        'verify_peer' => false,
        'verify_peer_name' => false,
    ],
]);
$api1 = "https://favicon.zhusl.com/ico?url="; //获取站点图标接口api
if($url){
    if(is_file('./cache/'.$url.'.png')){
        header("Content-Type:text/html;charset=utf-8");
    echo '文件已存在！';
    }else{
        $fav = $iconapi.$url;
        $fileCon = file_get_contents($fav);
        $localPath = "./cache/".$url.".png";
        file_put_contents($localPath,$fileCon);
        /* echo filesize($localPath); */        
        die($fileCon);
         }         
} else{
    header("Content-Type:text/html;charset=utf-8");
    echo '哈哈哈';
}