php Blob url to directory

throught ajax send a blob url

        var blob = new Blob([content], { type: 'text/html; charset=utf-8' });
        var urlBlob = URL.createObjectURL(blob);
        
        $.ajax({
            url: url,
            data: { 
                'blob': urlBlob
            },
            type: 'POST',
            dataType: 'json',
            success: function (data) {
               alert("ok");
            }
            , error: function () {
                alert('error');
            }
        });

in php i read this string blob:http://localhost:8888/4eca0076-33c8-42ab-bd96-11055dcf800f

now i'd like to save in a dir.... I tried

$file = fopen($filepath, "w");
fwrite($file, base64_decode($blob));
fclose($file);

OR

move_uploaded_file(base64_decode($blob), $filepath);

but write a strange characters

file_put_contents($filepath, base64_decode($blob));

don't works

do you ha ve idea?

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